Color Matching Adjustment for Studio Camera System 1

Home , Color chart

Color Matching Adjustment For Studio Camera System 1. Color Matching Adjustment 1-1. Introduction & Recommended Measuring Instruments Camera’s picture-making differs according to the model. Shooting with different models at the same time or editing the footage from them requires Color Matching Adjustment in advance. In this manual, how to adjust the color of HC3800 to a reference camera (other companies’ studio cameras or camera recorders also possible) is explained. As an example, AJ-HPX3100G is the reference camera in this explanation.

No. Name Remark

1 Grayscale Chart (VFK1642 ) 16：9 aspect, GS-HD M type / Murakami Color Research Laboratory 2 ChromaDuMonde 24+4 Chart (CDM28) 16：9 aspect, DSC 11 steps Grayscale/Log type (γ=0.45) / DSC labs 3 Macbeth Color Checker Chart 4：3 aspect, 18 color chip, 6 grayscale chip / Murakami Color Research Laboratory 4 Skin-tone Chart 16：9 aspect, CamBells / DSC Labs 5 Waveform Monitor LV-5330 or LV5700 / LEADER 6 Switcher AW-HS50 Easier way of comparing two camera pictures using WIPE function 7 HD Monitor BT-LH2170 or BT-LH1850 8 Halogen Light X2 500W, 3200K, mini stand type 9 Luxmeter T-10A / KONICA MINOLTA

© Panasonic Corporation 2014 1. Preparation of Adjustment 1-2. Recommended Test Chart and Equipment Grayscale Chart Skin-tone Chart 16：9 aspect (DSC Labs/ CamBells) 11 steps 16：9 aspect Log type (γ=0.45)

ChromaDuMonde 24+4 Chart (DSC labs / CDM28) 16：9 aspect DSC 11 steps Grayscale/Log type (γ=0.45)

Mcbeth Color Checker Chart 4：3 aspect 18 color chip 6 steps Grayscale

Halogen Light Waveform Monitor 500W / 3200K LV5330 / LEADER

Monitor Live Switcher BT-LH2170 AW-HS50

Monitor For MENU Operation

ROP Cable AK-HRP200/935A Halogen Light AK-HC3800/3500A

AK-HCU200/355A PM OUT

Distance : 3m

SDI OUT

Optical Fiber Cable Chart

Halogen Light SDI Out SDI IN 2 AJ-HPX3100A (Reference Camera) SDI IN 1 SDI OUT 1 SDI IN SDI OUT

Waveform Monitor

Switcher (AW-HS50)

Monitor

Monitor For MENU Operation

ROP Cable AK-HRP200/935A Halogen Light

AK-HC3800/3500A

AK-HCU200/355A PM OUT

Distance : 3m

SDI OUT

Optical Fiber Cable Chart

Halogen Light

SDI Out SDI IN 2 AJ-HPX3100A (Reference Camera) SDI IN SDI OUT 1 SDI IN SDI OUT 1

Waveform Monitor

Switcher (AW-HS50)

Monitor

1. Connect HD SDI OUTs of two Cameras to Input 1 and 2 of Switcher (AW-HS50) each. 2. Set the Switcher’s SDI OUT 1 to PGM OUT and connect it to WFM Monitor. 3. Connect the WFM Monitor’s OUT to Monitor. Setting up Switcher between Camera and WFM Monitor can make it easier to compare the two camera pictures and waveform(level comparison, etc.) using WIPE or other functions. In Color Matching Adjustment, MENU operations for GAMMA, FLARE, MATRIX, etc. are required. Separately from a monitor for picture comparison, if one for MENU checking is set up, operation and comparison will be easier. For HC3800 camera, connect a monitor to PM OUT of AK-HCU200 to output the MENU. For HC3500 camera, set its SDI OUT to VF OUT and connect a monitor. © Panasonic Corporation 2014 1. Preparation of Adjustment 1-4. Setting of the Camera and Lighting 1. Requirements for setting up Cameras and Lights 1-1. Requirements for setting up the two Cameras Position the two Cameras about three meters away from Chart. They should be as close to each other as possible so that their shooting angles are almost the same. Also their lens optical axes have to be as high as the center of Chart. Halogen light 1-2. Notes for setting up Light Sources Each of two sets of Lights (500W Halogen), as in the figure, should throw light at the same angle onto Chart. Set them up using the illuminometer so that the whole surface of Chart is lit up as evenly as possible. Its illuminance should be around 2,000 lux. If your Halogen Light has adjustable “SPOT-WIDE” function, WIDE is recommended. Reference Camera Camera Halogen light 45 Approx. 3m

45

Target Camera 90

Chart Chart

Halogen light Side view Top view

Framing the Chart

No Good No Good

Fix eight triangular marks onto the monitor’s image area. Good Good

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-1. Flowchart Accurate color matching between two cameras is not possible by the use of Color Chart only. Differences in brightness-related characteristics (GAMMA correction, Pedestal level, Flare level) make it difficult. Prior to matching using Color Chart, adjust GAMMA correction characteristics, Pedestal level and Flare level using Grayscale Chart to be able to conduct a more accurate matching. Follow the procedure below to perform color matching.

Basic Setting of the Camera

Check the Reference Camera AWB, ABB, GAMMA BALANCE, Flare condition with Grayscale chart

Adjusting the Target Camera with AWB, ABB, Pedestal level, GAMMA BALANCE, Flare Grayscale chart

Adjusting the Target Camera with Chroma Level, MATRIX 6 AXIS and 12 AXIS DSC Chart

Confirmation with Macbeth chart

Confirmation with Skin-tone Chart

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-2. Basic Setting of the Camera AK-HRP935A Turn OFF the following functions of Reference Camera and Target Camera (AK-HC3800/HC3500A). ① Knee/Auto Knee ② White Clip ③ DTL(H/V Detail)

・Knee/Auto Knee : If Knee is ON when Grayscale is shot, steps above the Knee

AK-HRP200 Point Level will be compressed to make it difficult to compare the levels between GAMMA corrections for high-brightness areas. ・White Clip : For Color Matching Adjustment, the cameras need to be set so that “100% White” part of Grayscale shows 100%. If White Clip setting is lower than 100%, reset it to either OFF or higher than 100% (factory setting: 109%). ・DTL(H/V Detail) : If DTL is ON, noise components will increase and checking the waveform and vector dot will be difficult. When setting the cameras via HRP200, which has no White Clip button, set them through MENU. © Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-3. Check the Reference Camera condition with Grayscale chart 2) PED with WFM GAINx5 Check the reference camera conditions. 1) Aim the camera at the Grayscale chart. 2) Execute “ABB” and close the IRIS to check pedestal level. In later pages, the pedestal level of target camera will be adjusted to this level. Pedestal 3) Open the IRIS and make adjustments to get 100% Level white level by turning the iris ring in the “CLOSE” direction. Then execute “AWB” with the grayscale 3,4) Check R, G and B Level=100%, chart. If the F number of iris at 100% white level is Grayscale cross point level and balance not between F4.0 and F5.6, set ND filter so that the iris is between F4.0 and F5.6. 100% 4) Repeat AWB and ABB several times. And adjust the Cross iris to get 100% white level. Point 5) Check the cross point level. When RGB cross points are not the same level, adjust them if necessary. The cross point level of target camera will be adjusted to this level in later pages.

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-3. Check the Reference Camera condition with Grayscale chart 6) Check FLARE and R, G and B balance Check the reference camera conditions. 6) Open the IRIS by 2.5 stops and check FLARE level and R, G and B FLARE balance. In later pages, the

Flare FLARE level of target camera will be adjusted to this Level level. 7) Adjust the IRIS to get 100% white level again.

7) Set 100% white by IRIS.

Iris full open to 100% white ( only one direction adjustment is recommended ) 1) Adjust the iris level so that the white level becomes 100%. If iris(F number) is not between F4.0 and F5.6, please change ND filter so that the iris is between F4.0 and F5.6 in the same way as the reference camera. (same level and conditions as the reference camera) Use the switcher to make this adjustment so that

Pedestal “100% White” part shows the same level. Note : The iris adjustment should be performed from FULL Open position to reduce the effect caused by Lens mechanical unevenness.

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-4. Adjusting the Target Camera with Grayscale chart 2-4-2. White Balance / Black Balance Adjustment AK-HRP200 1) Perform “AWB” and “ABB” several times. (around 3 times) Auto White Balance (AWB) and Auto Black Balance (ABB) have an effect on each other. So repeating them several times will AK-HRP935A lead to the optimum values. Also, when adjusting GAMMA, Flare or Pedestal, a slight change of the balance will occur, so executing AWB and ABB again is recommended.

1) Close the iris and adjust Master Pedestal(MP) so that the pedestal level becomes same level as the reference camera.

Master Pedestal 2) Perform ABB so that the Master Pedestal gain to be same as black level on each R,G,and B

Rch Gch Bch

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-4. Adjusting the Target Camera with Grayscale chart 2-4-4. Black Shading Confirmation (1) If Black Shading occurs (waveform is not flat) on Target Camera, follow the procedure below to compensate it. Also on Reference Camera, perform the compensation if necessary. For AK-HC3500A Saw Tooth and Parabola signals are used to compensate Black Shading so that R, G and B signals become flat for both Horizontal and Vertical directions. (Black Shading is caused by dark current of CCD.) Note: please ignore noise level which is prism spectrum characteristics on Rch and Bch. For AK-HC3800 AK-HC3800 has an automatic black shading compensation function. If Black Shading appears, please press “ABB” button for more than 2 sec. to perform Automatic Black Shading Compensation.

AK-HRP935A

X5 magnified

Black Shading : OFF Black Shading : Horizontal Rate Black Shading : Vertical Rate

Execute ABB again. This is because the shading adjustment effects Black Balance. Execute ABB and AWB several times (2-3 times) to have good signal balance.

Close the iris and make sure Black is located in the center of Vector Scope. If the center dot of Vector Scope is the nearest to the center and the closest to a complete round, Black Shading is compensated to the maximum.

Good No Good

Vector Scope scale : expand to Max or x5

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-4. Adjusting the Target Camera with Grayscale chart 2-4-6. Master Gamma Adjustment By making adjustments to Master GAMMA (M), adjust Gch cross point to the reference camera. If Rch and Bch levels are different from Gch, adjust R GAMMA and B GAMMA (R, B) to be the same level as Gch. Change the IRIS from “CLOSE” to “OPEN” and then back to “CLOSE” so as to confirm that the Grayscale waveform is the same at each level. If steps for low-brightness areas are not the same level, set BLACK GAMMA to ON and make adjustments using its R/M/B. Make further adjustments until steps of Grayscale are the same as the reference camera as much as possible in the end.

Adjust iris 100% white

Cross Point (by Master Gamma)

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-4. Adjusting the Target Camera with Grayscale chart 2-4-7. Flare confirmation and adjustment 1) Open the IRIS by 2.5 stops. Adjust FLARE level and R, G and B FLARE balance using MENU to get the same level as the reference camera. 2) Adjust the IRIS to get 100% white level. 3) Check that steps of Grayscale are the same as the reference camera as much as possible. If not, check PED, WHITE, GAMMA, FLARE once again.

Adjust FLARE and R, G and B balance Adjust 100% white level by IRIS.

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-5. Adjusting the Target Camera with DSC Chart 2-5-1. White Level Setting 1) Change the chart from Grayscale to DSC Chart (CDM28). 2) On both the reference and target cameras, adjust the IRIS so that “100% White” part of the grayscale on DSC Chart shows 100% on WFM. If this iris adjustment is incorrectly made, there will be some difference in Chroma Level when the color adjustment in VECTOR mode is performed in the next page. So adjust the IRIS accurately.

Adjust iris 100% white

CDM28 chart

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-5. Adjusting the Target Camera with DSC chart 2-5-2. Setting of Vector scope 1) Switch to VECTOR mode. Compare the 28-Dot Phase between the reference and target cameras. 2) For easy comparison, adjust GAIN in VECTOR mode to magnify the hexagonal dot. Using GAIN in X5 mode and Variable GAIN, make this adjustment so that R dot is in the “R” marker.

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-5. Adjusting the Target Camera with DSC chart 2-5-3. MATRIX Adjustment (Preset mode) Before 6-AXIS / 12-AXIS COLOR CORRECTION, adjust MATRIX PRESET and CHROMA LEVEL so that the dots on Vector Scope correspond approximately to the reference camera. 1) Press MENU button of AK-HRP200 to open ROP MENU. 2) Open the page of MATRIX (1/2) and set MATRIX PRESET to ON. 3) Switch the PRESET (NORMAL/EBU/NTSC) on the same page to find and select a preset that has the most similar dot phase to the reference camera. On AK-HC3800, NORMAL mode shows the most similar form to AJ-HPX3100. So select NORMAL.

AJ-HPX3100 AK-HC3800:NORMAL AK-HC3800:EBU AK-HC3800:NTSC

1) Next, on Color Control Menu, set CHROMA LEVEL SWITCH to ON. CHROMA LEVEL ADJUSTMENT will be active, so execute it to get the same chroma level as the reference camera. The whole form will become bigger or smaller. As a rough guide, make this adjustment so that each of six red dots in the figure below shows approximately the same level.

AJ-HPX3100 AK-HC3800 AK-HC3800: Color Control Menu CHROMA LEVEL

CDM28 chart

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-5. Adjusting the Target Camera with DSC chart 2-5-5. MATRIX 6 AXIS Adjustment 1) Adjust MATRIX (6-AXIS / MATRIX 1/2 page) so that the six red dots in the figure correspond to the reference camera as much as possible. Changes in waveform after adjustments to each of 6- AXIS items can be confirmed in the movie on the left side. Please refer to it when you make adjustments. Clearly in this movie, a change to each item has some effect on the whole vector waveform. Use the combination of these changes to get the same color phase as the reference camera.

AK-HC3800 MATRIX (1/2) AJ-HPX3100

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-5. Adjusting the Target Camera with DSC chart 2-5-6. MATRIX 12 AXIS Adjustment 1) Adjust MATRIX (12-Axis / MATRIX 2/2 page) so that the six red dots in the figure correspond to the reference camera as much as possible. Changes in waveform after adjustments to “R” of 12- AXIS can be confirmed in the movie on the left side. Please refer to it when you make adjustments. Compare both cameras’ color phases to figure out which items are for the dots in different positions from the reference camera. Then use PHASE and SAT of such items to make fine adjustments.

AK-HC3800 MATRIX (2/2) AJ-HPX3100

© Panasonic Corporation 2014 2. Procedure of Color Matching Adjustment 2-6. Confirmation with Macbeth chart 1) Change the chart from DSC Chart to Macbeth Chart. 2) Switch the WFM Monitor to WFM mode and, on both the reference and target cameras, adjust the IRIS so that “White” at the lower left of the chart shows 100%. 3) Switch to Vector mode to check the color phase (dot). 4) If the position of a dot is different, make adjustments using 6- AXIS and 12-AXIS. 5) Confirm that each color looks the same on the Monitor. Switcher’s WIPE function makes it easy to confirm this. 100% Mg - Adjust Green and Magenta using “R-G” and “B-G”. - Adjust other parameters to make other dots match as G much as possible. - Adjust each parameter 2 or 3 times repeatedly.

1) After adjusting MATRIX (6-AXIS and 12- AXIS), check with a skin tone chart, e.g. CamBelles, or people’s faces on the color monitor.

CamBelles chart