(19) TZZ¥___T

(11) EP 3 141 999 A1

(12) EUROPEAN PATENT APPLICATION

(43) Date of publication: (51) Int Cl.: 15.03.2017 Bulletin 2017/11 G06F 3/12 (2006.01) G06K 15/02 (2006.01)

(21) Application number: 16186954.0

(22) Date of filing: 02.09.2016

(84) Designated Contracting States: (71) Applicant: OCE-Technologies B.V. AL AT BE BG CH CY CZ DE DK EE ES FI FR GB 5914 CA Venlo (NL) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (72) Inventor: GERRITS, Antonius Maria Designated Extension States: 5914 CA VENLO (NL) BA ME Designated Validation States: (74) Representative: OCE IP Department MA MD St. Urbanusweg 43 5914 CA Venlo (NL) (30) Priority: 08.09.2015 EP 15184340

(54) A PRINTING SYSTEM COMPRISING A RASTER IMAGE PROCESSOR UNIT AND A METHOD FOR PRINTING BY MEANS OF SAID PRINTING SYSTEM

(57) The invention relates to a printing system for printing a print job, the printing system comprising a re- ceiving unit, a control unit, a raster image processor unit, a print unit and a user interface unit, wherein the receiving unit configured to receive the print job, the raster image processor unit configured to rasterize the print job ac- cording to predetermined raster image processor set- tings, the print unit configured to print the rasterized print job, the control unit configured to control the rastering process of the print job and the printing process of the rasterized print job, and the user interface unit for com- munication between a user of the printing system and the control unit, wherein the control unit comprises an analyzing unit configured to analyse properties of print data of the print job, and a comparing unit configured to compare the properties of the analysed print data with the predetermined raster image processor settings, wherein, upon detection of a discrepancy between the properties and the predetermined raster image proces- sor settings by the comparing unit, the control unit notifies the user of the printing system of said discrepancy for taking an action for whether or not solving the detected discrepancy. The invention also relates to a method suitable for application in the printing system. EP 3 141 999 A1

Printed by Jouve, 75001 PARIS (FR) 1 EP 3 141 999 A1 2

Description raster imageprocessor. A discrepancy between the prop- erties of the print job and predetermined raster image Field of the invention processor settings may lead to incorrect print output. For example, if a setting for switching on or off a specific [0001] The invention relates to a printing system for 5 functionality of the raster image processor is switched off printing a print job, the printing system comprising a re- while from the print data it has to be concluded that this ceiving unit, a control unit, a raster image processor unit, functionality should be used while ripping an input doc- a print unit and a user interface unit, wherein the receiving ument. For example, if a setting for switching on or off a unit is configured to receive the print job, the raster image specific functionality of the raster image processor is processor unit is configured to rasterize the print job ac- 10 switched off while from the print data it has to be con- cording to predetermined raster image processor set- cluded that this functionality is preferably to be used while tings, the print unit is configured to print the rasterized ripping an input document. print job, the control unit is configured to control the ras- [0009] An object of the present invention is to provide tering process of the print job and the printing process of a printing system in which incorrect print output due to the rasterized print job, and the user interface unit is con- 15 such a discrepancy is avoided. figured to communicate between a user of the printing system and the control unit. Summary of the invention [0002] By the term printing system a system is meant that has a print function, for example a printer, a copier, [0010] The object is achieved in a printing system of a multi-functional, a roll-to-roll printer, a roll-to-sheet20 the above-mentioned kind, wherein wherein the control printer, a cut sheet printer, a flatbed printer, a wide-format unit comprises an analyzing unit configured to analyse printer, a relief printer or a 3D printer. properties of print data of the print job, and a comparing [0003] By the term raster image processor unit is unit configured to compare the properties of the analysed meant a unit comprising a raster image processor which print data with the predetermined raster image processor produces a raster image also known as a bitmap. Such 25 settings, wherein, upon detection of a discrepancy be- a bitmap is used by later stage of the printing system in tween the properties and the predetermined raster image the print unit to produce the printed output. The input may processor settings by the comparing unit, the control unit be a page description in a high-level page description notifiesthe user of the printingsystem ofsaid discrepancy language such as PostScript, Portable Document For- for taking an action for whether or not solving the detected mat, XPS or another bitmap of higher or lower resolution 30 discrepancy. Both the print data knowledge and the than the print unit. In the latter case, the raster image raster image processor settings are combined in one processor applies either smoothing or interpolation algo- place and the notification is given without a need for sep- rithms to the input bitmap to generate the output bitmap. arate print job settings or separate print job settings that [0004] The term raster image processor will also be may aid to detect a suspect combination. abbreviated with RIP. The process executed by the raster 35 [0011] According to an embodiment a predetermined image processor is also mentioned as "ripping". raster image processor setting is a setting for switching [0005] The present invention further relates to a meth- on or off of a specific functionality of the raster image od which is applicable in a printing system according to processor. Such specific functionality may be spot color the invention. matching, transparency support also known as overprint 40 support, printing black and white, etc. Background of the invention [0012] According to an embodiment the control unit is configured in case of a detected discrepancy between [0006] Nowadays, a print job with print data is submit- the properties and the predetermined raster image proc- ted to the receiving unit of the printing system with print essor settings to prohibit or at least to postpone the print- job settings also known as print job properties. The raster 45 ing of the print job by the print unit. The user interface of image processor is configured according to predeter- the printing system may show a print queue of scheduled mined raster image processor settings for ripping the print jobs. When a print job with a detected discrepancy print data. arrives at the top of the print queue for printing, the control [0007] The raster image processor may also be used unit may automatically stop the printing by the print unit. to enable printing of a colour document on a black and 50 By doing so the print job is prevented from being printed white printer and to enable printing of a black and white with incorrect settings. document on a colour printer. The detection of the discrepancy may be indicated by a [0008] Pre-flight tools are known which give informa- digital information item to be displayed near the print job tion about the page description language input of a print in the displayed print queue at the user interface. Also job but are not aware of any predetermined raster image 55 an operator may select a print job from the print queue, processing setting in the printing system. A predeter- which print job is accompanied by the digital information mined raster image processor setting may be a setting item, before the print job reaches the top of the print for switching on or off of a specific functionality of the queue. By selecting the print job in this way, the operator

2 3 EP 3 141 999 A1 4 implicitly puts the print job on hold for solving the discrep- in the print data which spot color is not present in the spot ancy. color library on the raster image processor while spot [0013] According to an embodiment the action for color matching is off. A warning may be issued that there whether or not solving the detected discrepancy is se- is an unknown spot color present in the print data. lected out of changing at least one predetermined raster 5 [0018] According to an embodiment the user interface image processor setting, editing the print data of the print unit is configured to display a print job properties window, job, and confirming to proceed with the current print data and upon a change of a print job property on the print job of the print job as well as the predetermined raster image property window, the comparing unit and the analyzing processor settings. unit are configured to detect a discrepancy between the [0014] According to an embodiment the control unit is 10 changed print job property and the raster image proces- configured to apply the further dedicated action to print sor settings. jobs subsequent to the print job on request of the user [0019] According to an embodiment the printing sys- by means of the user interface. tem comprises a prepress application unit, and the con- [0015] According to an embodiment the discrepancy trol unit is configured to communicate the predetermined is detected between the properties of the print job and a 15 raster image processor settings to the prepress applica- predetermined raster image processor setting for switch- tion unit and the prepress application unit is configured ing on or off a specific functionality of the raster image to detect a discrepancy between the predetermined processor unit which setting is switched off while the an- raster image processing settings and print data of a print alyzing unit concludes from the print data of the print job job received by the prepress application running on the that the specific functionality is necessarily to be used 20 prepress application unit. while ripping the print data of the print job. The specific [0020] The invention further relates to a method for functionality is considered to be necessarily to be used printing a print job by a printing system, the method com- while ripping the print data of the print job if the print job prising the steps of receiving the print job at the printing cannot be printed without the specific functionality. The system, rasterizing the print job according to predeter- specific functionality is considered to be relevant to be 25 mined raster image processor settings, and printing the used while ripping the print data of the print job if the rasterized print job, wherein the method further compris- specific functionality influences the output of the print job, es the steps of analyzing properties of print data of the for example if certain color objects in the print data are print job, comparing the properties of the analysed print treated differently in color management of the RIP and data with the predetermined raster image processor, de- these kind of color objects are present in the print job. 30 tectinga discrepancy between theproperties and thepre- [0016] According to an embodiment the discrepancy determined raster image processor settings by the com- is detected between the properties of the print job and a paring unit, and notifying a user of the printing system of predetermined raster image processor setting for switch- said discrepancy for taking an action for whether or not ing on or off a specific functionality of the raster image solving the detected discrepancy. processor unit which setting is switched on while the an- 35 According to an embodiment of the method the discrep- alyzing unit concludes from the print data of the print job ancy is detected between the properties and a raster im- that the specific functionality must not be used while rip- age processor setting out of a raster image processor ping the print data of the print job. setting for switching between enabling and disabling spot [0017] According to an embodiment the discrepancy color matching, a raster image processor setting for is detected between the properties and a raster image 40 switching between enabling and disabling overprint sup- processor setting out of a raster image processor setting port, a raster image processor setting for spot color for switching between enabling and disabling spot color matching while a spot color in the print data is not present matching, a raster image processor setting for switching in a spot color library of the control unit, and a raster between enabling and disabling overprint support, a image processor setting for switching between color raster image processor setting to a spot color which is 45 printing and black and white printing. not present in a spot color library of the control unit, and [0021] The invention also relates to a computer-pro- a raster image processor setting for switching between gram product embodied on a non-transitory computer color printing and black and white printing. A discrepancy readable medium and configured to execute a method may occur in a situation that spot color matching is on according to the invention when executed on a proces- but the spot colors in the print data to match are not50 sor. present in a spot color library on the raster image proc- [0022] The invention also relates to a non-transitory essor. A discrepancy may occur in a situation that spot data carrier having stored thereon the computer-program color matching is off but at least one spot color is present product mentioned here-above. in the print data which at least one spot color is also present in the spot color library on the raster image proc- 55 Brief descriptions of the drawings essor. A discrepancy may occur in a situation that spot color matching is on but the print data contains no spot [0023] Embodiment examples will now be described colors. It may also occur that there is a spot color present in conjunction with the drawings, wherein:

3 5 EP 3 141 999 A1 6

Fig. 1 is a block diagram of a printing system accord- printed on the media, the printed media is guided to an ing to the invention; output tray 114. The control unit 104 is configured to con- trol the rastering process of the print job and the printing Fig. 2 illustrates a user interface window of the print- process of the rasterized print job. The user interface unit ing system showing a print queue of submitted 5 110, e.g. a digital work station, is configured to commu- print jobs according to the invention; nicate between a user of the printing system 100 and the control unit 104. The control unit 104 comprises an an- Fig. 3 illustrates a user interface window of the print- alyzing unit 116 configured to analyse properties of print ingsystem showing print jobproperties of a print data of the print job, and a comparing unit 118 configured job selected from the print queue; 10 to compare the properties of the analysed print data with the predetermined raster image processor settings. Fig. 4 illustrates a user interface window of the print- [0026] The user interface 110 has a control panel with ing system showing system settings including a display e.g. in the form of a touch-sensitive screen settings for the RIP unit according to the inven- which, in this example, shows a user interface window tion; 15 200. The user interface window 200 is shown in detail in Fig. 2. Fig. 5 illustrates a user interface window of the print- [0027] Fig. 2 shows the user interface window 200 of ing system showing the print queue with an user the printing system 100 according to the invention. In an operable digital item regarding a detected dis- alternative embodiment part of the functionality - like but- crepancy according to the invention; 20 tons - of this user interface window is designed as hard- ware buttons near the user interface window 200. The Fig. 6 illustrates a user interface window of the print- user interface window 200 is opened at the user interface ing system showing a message regarding a de- unit 110 in Fig. 1 and shows a representation of the print tected discrepancy according to the invention queue residing in the control unit 104 in Fig. 1. for the user of the printing system; and 25 [0028] The user interface window 200 comprises a title section 210, a user action section 220, a print queue sec- Fig. 7 is a flow diagram of an embodiment of the meth- tion 230 and a navigation section 240. od according to the invention. [0029] The user action section 220 comprises user op- erable items 221 - 225 to be selected for executing ac- Detailed description of the embodiments 30 tions on one or more selected print jobs in the print queue 23A in the print queue section 230. [0024] As an illustrative example, Fig. 1 shows sche- A first user operable item 221 represents a job removal matically a printing system 100 for printing a print job. action. The printing system 100 comprises a receiving unit 102, A second user operable item 222 represents a job dupli- a control unit 104, a raster image processor unit 106, a 35 cation action. print unit 108 and a user interface unit 110. A third user operable item 223 represents a move up The various parts of the printing system 100 are control- action. led by the control unit 104, directly or through the agency A fourth user operable item 224 represents a move down of sub-control modules 102, 106, 108, 116, 118, 110. action. The receiving unit 102, the raster image processor unit 40 A fifth user operable item 225 represents an action to 106 and the print unit 108 are connected to the control retrieve and display properties and settings of a selected unit 104, which is also connected to the user interface print job in a properties window as shown in Fig. 3. unit 110 provided with user interface window 200 with [0030] The navigation section 240 comprises a first us- operator control elements and a display element, for ex- er operable item 241 for navigating to a schedule with a ample an LCD screen in the form of a touch screen for 45 timeline and media needed for the print jobs, a second use by an operator at the printing system 100. user operable item 242 for navigating to an overview of [0025] When a print job is received by the receiving the input trays 112 (See Fig. 1) and the content of the unit 102, the received print job is processed by the raster input trays, a third user operable item 243 for navigating image processor unit 106. The raster image processor to the system settings shown in Fig. 4, and a fourth user unit 106 is configured to rasterize the print job according 50 operable item 244 for navigating to the print jobs in the to predetermined raster image processor settings. When print queue 23A. the print job is rasterized into a bitmap, the bitmap is [0031] The print queue section 230 comprises a rep- positioned in a digital print queue of scheduled print jobs resentation of the print queue 23A. The print queue 23A to be printed. When the bitmap arrives at the head of the may be empty or comprises at least one print job. Fig. 2 print queue, the bitmap will be printed by the print unit 55 shows a plurality of print jobs 231 - 237 in the print queue 108. The print job will be printed on media loaded in one 23A in a sequence order from top to bottom. A first print of the input trays 112. The media is guided along a paper job 231 will be printed real soon after the current print job path (not shown) to the print unit 108. After the bitmap is (not shown) that is currently printed by the printing device

4 7 EP 3 141 999 A1 8 is ready. A last print job 237 will be printed if the preceding for the print unit of the printing system, like a resolution print jobs 231 - 236 are ready. Each print job 231 - 237 setting 412, a setting 414 for media in a standard tray of in the print queue 23A is selectable by a mouse or by a the printing system, a finishing interface setting 416 and finger or stylus in case of a touch screen. A sequence a default output tray 418 order of the print jobs 231 - 237 in the print queue 23A 5 A second part 420 of the system settings are the raster may be changed by selecting a print job in the print queue image processor settings 410 according to the invention 23A and then activating the third user operable item 223 which are predetermined for the raster image processor or the fourth user operable item 224 in order to move the unit 106 (See Fig. 1). Hereinafter the term "raster image selected print job one position up or down respectively processor" will be abbreviated to RIP. in the print queue 23A. In a further embodiment in case 10 [0037] A first RIP setting 422 is a switch setting named of a touch screen a position of a print job 231 - 237 in the "spot color on/off". print queue 23A may be changed by dragging and drop- If a value of the first RIP setting 422 is equal to "spot color ping the appropriate print job to another position in the on" spot colors will be searched for in the print data. Each print queue. The print queue 23A is scrollable by activat- found spot color in the print data will be mapped to spot ing an upward scrolling button 238 or a downward scroll- 15 color set in a library of spot colors in the control unit 104 ing button 239. Each print job 231 - 237 in the print queue of the printing system 100. If a value of the first RIP setting 23A may be displayed with a number of properties of the 422 is equal to "spot color off’ spot colors will not be print job, such as an identifying name of the print job searched for in the print data. Each spot color in the print ("Print job 1 "), a size of the image receiving material to data will be regularly printed as an approximating RGB be used for the print job ("A3"), the medium type of the 20 / CMYK color value. image receiving material ("Red Label"), etc. For conven- According to an embodiment of the printing system, the ience reasons a small relevant number of properties for printing system has a so-called "spot color not present each print job 231 - 237 is displayed in the print queue strategy". 23A. In a spot color not present strategy spot colors are [0032] Fig. 3 illustrates a display window 300 of a user 25 searched for in the print data and in case a spot color is interfaceof the printingsystem showingthe printjob prop- detected in the print data which is not present in the spot erties and settings of print job 231 (See Fig. 2) after se- color library in the control unit 104 of the printing system lecting the first print job 231 and activating the fifth user 100, a "spot color not present" strategy will be executed. operable item 225 (See Fig. 2). A "spot color not present" strategy may be: [0033] The print job properties and settings comprise 30 a file name 310, a medium size 320, a medium type 330, 1. continue without spot color matching, a color / grayscale indication 340, a number of copies 2. continue without spot color matching only for the 350, an orientation 360 (portrait / landscape), a print job spot color which is not present, or plexity indication 370 (single sided / double sided), a fin- 3. add spot color to the spot color library and contin- ishing option 380 like Staple, Binding, etc, and a spot35 ue. color matching indication 390. [0034] The file name 310 has an extension ".pdf" which [0038] In another spot color not present strategy spot indicates that the print data has a portable document for- colors are searched for in the print data and in case a mat. The print data of the pdf file 310 comprises spot spot color is detected in the print data which is not present colors. The analyzing unit 116 (See Fig. 1) configured to 40 in a spot color library in the control unit 104 of the printing analyse properties of print data of the print job analyses system 100, no "spot color not present" strategy will be the print data and - for example - retrieves spot color use executed. An alternative approximating color will be print- from the print data. For example, spot colors A, B, C are ed instead of the detected spot color which is not present found to be used in case of printing the pdf file 310. in the library for spot colors in the control unit 104. [0035] According to Fig. 3 the spot color matching is 45 [0039] A second RIP setting 424 is a switch setting set to "on" for the print job. The spot color matching in- named "transparency support on/off". If a value of the dication 390 in the print job properties may overrule a second RIP setting 424 is equal to "transparency support system setting for spot color matching. If the user is ed- on" parts of the print data specified to be printed in an iting the setting of spot color matching from "on" to "off" overprint mode will be searched for in the print data and and the analyzing unit concludes that the print data con- 50 will be taken into account by mixing a color according to tains a spot color to be matched, the user interface win- a mixing recipe while ripping the print data. The mixing dow may show a pop up window for warning the user for recipe depends on the amount of transparency. If a value this discrepancy. of the second RIP setting 424 is equal to "transparency [0036] Fig. 4 illustrates a display window 400 of a user support off" parts of the print data specified to be printed interface of the printing system showing the system set- 55 in an overprint mode will not be searched for in the print tings of the printing system 100 after selecting the third data and will not be taken into account by ignoring colors user operable item 243 (See also Fig. 2). underneath a top color while ripping the print data. A first part 410 of the system settings are print settings [0040] The comparing unit 118 compares the prede-

5 9 EP 3 141 999 A1 10 termined RIP settings with the analyzed properties and ties of the print job and a predetermined RIP setting for content of the print data of a print job. switching on or off a specific functionality of the RIP unit If a discrepancy is detected by the comparing unit, the which setting is switched on while the analyzing unit con- user is notified by a warning icon shown in user interface cludes from the print data of the print job that the specific window 500 shown in Fig. 5. The warning icon 510 is 5 functionality is not necessarily to be used while ripping positioned near the job entry of the appropriate print job. the print data of the print job. The warning icon 510 may be activated for further infor- The detected discrepancy between the properties and a mation as shown in Fig. 6. RIP setting may concern a RIP setting for switching be- [0041] Fig.6 shows user interface window 600 display- tween enabling and disabling spot color matching, a RIP ing a message 610 for the user of the printing system 10 setting for switching between enabling and disabling a that a discrepancy is detected between the print data of transparency support also known as overprint function- the print job 233 and the RIP settings of the RIP unit 106. ality, a RIP setting having set to spot color matching "on" In this example, the value of the first RIP setting 422 in while the spot colors to match are not present in a spot Fig. 4 is equal to "Spot color off" while the print data of color library of the control unit, and/or a RIP setting for print job 233 actually contains at least one spot color. 15 switching between color printing and black and white The user is asked if he wants to switch on the use of spot printing. colors or to proceed with the current settings. If the user The user may take an action for whether or not solving decides to switch on the use of spot colors, he may ac- the detected discrepancy. The action may be an action tivate a first button 612 and the first RIP setting 422 will to change at least one predetermined raster image proc- be set to "Spot color on". If the user decides not to switch 20 essor setting, an action to edit the print data of the print on the use of spot colors, he may activate a second button job, or an action to confirm to proceed with the current 614 and the value of the first RIP setting 422 will remain print dataof theprint jobas well as with the predetermined the same ("spot color off"). raster image processor settings. [0042] Other kind of user operable digital objects may [0048] After the fifth step S5 the method returns to the be envisioned on the respective user interface windows 25 fourth step S4 in order to check for more detected dis- shown in Fig. 2 - 6. crepancies. [0043] An embodiment of the method according to the [0049] The method ends in the end point B. invention is explained in Fig. 7. A starting point A in Fig. [0050] Detailed embodiments of the present invention 7 leads to a first step S1. are disclosed herein; however, it is to be understood that [0044] In the first step S1 a print job is received at the 30 the disclosed embodiments are merely exemplary of the printing system. The receiving unit of the printing system invention, which can be embodied in various forms. is configured to receive the print job and store it in storage Therefore, specific structural and functional details dis- of the printing system. closed herein are not to be interpreted as limiting, but In a second step S2 properties of print data of the print merely as a basis for the claims and as a representative job are analysed. The analysing unit residing in the con- 35 basis for teaching one skilled in the art to variously em- trol unit is configured to analyse the print data and its ploy the present invention in virtually any appropriately properties. detailed structure. [0045] In a third step S3 the properties of the analysed print data are compared with the predetermined RIP set- tings. The comparing unit residing in the control unit is 40 Claims configured to compare the predetermined RIP settings with the analysed print data. 1. Printing system for printing a print job, the printing [0046] In a fourth step S4 it is checked by the compar- system comprising a receiving unit, a control unit, a ing unit if there is a discrepancy between the properties raster image processor unit, a print unit and a user and the predetermined RIP settings. If so, the method 45 interface unit, wherein proceeds to a fifth step S5. Otherwise the method ends the receiving unit configured to receive the print job, in an end point B. the raster image processor unit configured to raster- [0047] In the fifth step S5 a user of the printing system ize the print job according to predetermined raster is notified for the detected discrepancy by means of the image processor settings for switching on or off of a user interface. 50 specific functionality of the raster image processor The discrepancy may be detected between the proper- unit, ties of the print job and a predetermined RIP setting for the print unit configured to print the rasterized print switching on or off a specific functionality of the RIP unit job, which setting is switched off while the analyzing unit con- the control unit configured to control the rastering cludes from the print data of the print job that the specific 55 process of the print job and the printing process of functionality is necessarily to be used while ripping the the rasterized print job, and print data of the print job. the user interface unit configured to communicate The discrepancy may be detected between the proper- between a user of the printing system and the control

6 11 EP 3 141 999 A1 12

unit, claims,wherein thediscrepancy isdetected between wherein the properties and a raster image processor setting the control unit comprises out of a raster image processor setting for switching an analyzing unit configured to analyse properties between enabling and disabling spot color matching, of print data of the print job, and 5 a raster image processor setting for switching be- a comparing unit configured to compare the proper- tween enabling and disabling an overprint support, ties of the analysed print data with the predetermined a rasterimage processorsetting to a spotcolor which raster image processor settings, is not present in a spot color library of the control wherein, unit, and a raster image processor setting for switch- upon detection of a discrepancy between the prop- 10 ing between color printing and black and white print- erties and the predetermined raster image processor ing. settings by the comparing unit, the control unit noti- fies the user of the printing system of said discrep- 8. Printing system according to any of the preceding ancy for taking an action for whether or not solving claims, wherein the user interface unit is configured the detected discrepancy. 15 to display a print job properties window, and upon a change of a print job property on the print job property 2. Printing system according to any of the preceding window, the comparing unit and the analyzing unit claims, wherein the control unit is configured in case are configured to detect a discrepancy between the of a detected discrepancy between the properties changedprint jobproperty and theraster image proc- and the predetermined raster image processor set- 20 essor settings. tings to prohibit or at least to postpone the printing of the print job by the print unit. 9. Printing system according to any of the preceding claims, wherein printing system comprises a pre- 3. Printing system according to any of the preceding press application unit, and the control unit is config- claims, wherein the action for whether or not solving 25 ured to communicate the predetermined raster im- the detected discrepancy is selected out of changing age processor settings to the prepress application at least one predetermined raster image processor unit and the prepress application unit is configured setting, editing the print data of the print job, and to detect a discrepancy between the predetermined confirming to proceed with the current print data of raster image processing settings and print data of a the print job as well as the predetermined raster im- 30 print jobreceived by theprepress application running age processor settings. on the prepress application unit.

4. Printing system according to any of the preceding 10. Method for printing a print job by a printing system, claims, wherein the control unit is configured to apply the method comprising the steps of the action to print jobs subsequent to the print job on 35 request of the user by means of the user interface. - receiving the print job at the printing system, - rasterizing the print job according to predeter- 5. Printing system according to any of the preceding mined raster image processor settings for claims, whereinthe discrepancy is detected between switching on or off of a specific functionality of the properties of the print job and a predetermined 40 a raster image processor unit, and raster image processor setting for switching on or off - printing the rasterized print job by the raster a specific functionality of the raster image processor image processor unit, unit which setting is switched off while the analyzing unit concludes from the print data of the print job that wherein the specific functionality is necessarily to be used 45 the method further comprises the steps of while ripping the print data of the print job. analyzing properties of print data of the print job, comparing the properties of the analysed print data 6. Printing system according to any of the preceding with the predetermined raster image processor set- claims, whereinthe discrepancy is detected between tings, the properties of the print job and a predetermined 50 detecting a discrepancy between the properties and raster image processor setting for switching on or off the predetermined raster image processor settings a specific functionality of the raster image processor by the comparing unit, and unit which setting is switched on while the analyzing notifying a user of the printing system of said dis- unit concludes from the print data of the print job that crepancy for taking an action for whether or not solv- the specific functionality must not be used while rip- 55 ing the detected discrepancy. ping the print data of the print job. 11. Method according to claim 10, wherein the discrep- 7. Printing system according to any of the preceding ancy is detected between the properties and a raster

7 13 EP 3 141 999 A1 14

image processor setting out of a raster image proc- essor setting for switching between enabling and dis- abling spot color matching, a raster image processor setting for switching between enabling and disabling overprint support, a raster image processor setting 5 for spot color matching while a spot color present in the print data is not present in a spot color library of the control unit, and a raster image processor setting for switching between color printing and black and white printing. 10

12. Computer-program product embodied on a non- transitory computer readable medium and config- ured to execute a method according to any of claims 10 - 11 when executed on a processor. 15

13. A non-transitory data carrier having stored thereon the computer-program product according to claim 12. 20

25

30

35

40

45

50

55

8 EP 3 141 999 A1

9 EP 3 141 999 A1

10 EP 3 141 999 A1

11 EP 3 141 999 A1

12 EP 3 141 999 A1

13 EP 3 141 999 A1

14 EP 3 141 999 A1

15 EP 3 141 999 A1

5

10

15

20

25

30

35

40

45

50

55

16 EP 3 141 999 A1

5

10

15

20

25

30

35

40

45

50

55

17