Color Photography, an Instrumentality of Proof Edwin Conrad
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Digital Holography Using a Laser Pointer and Consumer Digital Camera Report Date: June 22Nd, 2004
Digital Holography using a Laser Pointer and Consumer Digital Camera Report date: June 22nd, 2004 by David Garber, M.E. undergraduate, Johns Hopkins University, [email protected] Available online at http://pegasus.me.jhu.edu/~lefd/shc/LPholo/lphindex.htm Acknowledgements Faculty sponsor: Prof. Joseph Katz, [email protected] Project idea and direction: Dr. Edwin Malkiel, [email protected] Digital holography reconstruction: Jian Sheng, [email protected] Abstract The point of this project was to examine the feasibility of low-cost holography. Can viable holograms be recorded using an ordinary diode laser pointer and a consumer digital camera? How much does it cost? What are the major difficulties? I set up an in-line holographic system and recorded both still images and movies using a $600 Fujifilm Finepix S602Z digital camera and a $10 laser pointer by Lazerpro. Reconstruction of the stills shows clearly that successful holograms can be created with a low-cost optical setup. The movies did not reconstruct, due to compression and very low image resolution. Garber 2 Theoretical Background What is a hologram? The Merriam-Webster dictionary defines a hologram as, “a three-dimensional image reproduced from a pattern of interference produced by a split coherent beam of radiation (as a laser).” Holograms can produce a three-dimensional image, but it is more helpful for our purposes to think of a hologram as a photograph that can be refocused at any depth. So while a photograph taken of two people standing far apart would have one in focus and one blurry, a hologram taken of the same scene could be reconstructed to bring either person into focus. -
Holography Split-Beam Transmission Hologram
Physics 331A Experiment 8 HOLOGRAPHY Revised 16 May 2005. When a hologram is made, a coherent beam of light is divided so that one beam (the reference beam) falls directly onto a piece of photographic film and another beam (the object beam) is formed from the light that is scattered by an object and falls onto the same piece of film. When the two beams are recombined in this way, they make an interference pattern which is recorded on the film. If the film is illuminated with coherent light, the light will be diffracted as if by a diffraction grating, giving rise to a diffraction pattern containing the zeroth and first orders. The first order reproduces the full wavefront of the light scattered from the original object and gives a 3D virtual image of the object for the light transmitted through the film and a 3D real image for the light reflected from the film. The purpose of this experiment is to investigate the properties of holograms by 1) making a transmission hologram of actual objects and observing its optical characteristics, and 2) making a diffraction grating by combining two beams of light in order to examine the holographic process in its simplest form. REFERENCES 1. Lipson, Optical Physics (3rd ed.), pp. 363-370. 2. M. Fran¸con, Holography, pp. 17-23, 29-36. (especially for understanding the diffraction grating) 3. M. Parker Givens, \Introduction to Holography," Am. J. Phys. 35, 1056 (1967). 4. J. E. Kasper and S. A. Feller, The Complete Book of Holograms: How they work and how to make them. -
Session Outline: History of the Daguerreotype
Fundamentals of the Conservation of Photographs SESSION: History of the Daguerreotype INSTRUCTOR: Grant B. Romer SESSION OUTLINE ABSTRACT The daguerreotype process evolved out of the collaboration of Louis Jacques Mande Daguerre (1787- 1851) and Nicephore Niepce, which began in 1827. During their experiments to invent a commercially viable system of photography a number of photographic processes were evolved which contributed elements that led to the daguerreotype. Following Niepce’s death in 1833, Daguerre continued experimentation and discovered in 1835 the basic principle of the process. Later, investigation of the process by prominent scientists led to important understandings and improvements. By 1843 the process had reached technical perfection and remained the commercially dominant system of photography in the world until the mid-1850’s. The image quality of the fine daguerreotype set the photographic standard and the photographic industry was established around it. The standardized daguerreotype process after 1843 entailed seven essential steps: plate polishing, sensitization, camera exposure, development, fixation, gilding, and drying. The daguerreotype process is explored more fully in the Technical Note: Daguerreotype. The daguerreotype image is seen as a positive to full effect through a combination of the reflection the plate surface and the scattering of light by the imaging particles. Housings exist in great variety of style, usually following the fashion of miniature portrait presentation. The daguerreotype plate is extremely vulnerable to mechanical damage and the deteriorating influences of atmospheric pollutants. Hence, highly colored and obscuring corrosion films are commonly found on daguerreotypes. Many daguerreotypes have been damaged or destroyed by uninformed attempts to wipe these films away. -
Digital Camera Functions All Photography Is Based on the Same
Digital Camera Functions All photography is based on the same optical principle of viewing objects with our eyes. In both cases, light is reflected off of an object and passes through a lens, which focuses the light rays, onto the light sensitive retina, in the case of eyesight, or onto film or an image sensor the case of traditional or digital photography. The shutter is a curtain that is placed between the lens and the camera that briefly opens to let light hit the film in conventional photography or the image sensor in digital photography. The shutter speed refers to how long the curtain stays open to let light in. The higher the number, the shorter the time, and consequently, the less light gets in. So, a shutter speed of 1/60th of a second lets in half the amount of light than a speed of 1/30th of a second. For most normal pictures, shutter speeds range from 1/30th of a second to 1/100th of a second. A faster shutter speed, such as 1/500th of a second or 1/1000th of a second, would be used to take a picture of a fast moving object such as a race car; while a slow shutter speed would be used to take pictures in low-light situations, such as when taking pictures of the moon at night. Remember that the longer the shutter stays open, the more chance the image will be blurred because a person cannot usually hold a camera still for very long. A tripod or other support mechanism should almost always be used to stabilize the camera when slow shutter speeds are used. -
Pale Intrusions Into Blue: the Development of a Color Hannah Rose Mendoza
Florida State University Libraries Electronic Theses, Treatises and Dissertations The Graduate School 2004 Pale Intrusions into Blue: The Development of a Color Hannah Rose Mendoza Follow this and additional works at the FSU Digital Library. For more information, please contact [email protected] THE FLORIDA STATE UNIVERSITY SCHOOL OF VISUAL ARTS AND DANCE PALE INTRUSIONS INTO BLUE: THE DEVELOPMENT OF A COLOR By HANNAH ROSE MENDOZA A Thesis submitted to the Department of Interior Design in partial fulfillment of the requirements for the degree of Master of Fine Arts Degree Awarded: Fall Semester, 2004 The members of the Committee approve the thesis of Hannah Rose Mendoza defended on October 21, 2004. _________________________ Lisa Waxman Professor Directing Thesis _________________________ Peter Munton Committee Member _________________________ Ricardo Navarro Committee Member Approved: ______________________________________ Eric Wiedegreen, Chair, Department of Interior Design ______________________________________ Sally Mcrorie, Dean, School of Visual Arts & Dance The Office of Graduate Studies has verified and approved the above named committee members. ii To Pepe, te amo y gracias. iii ACKNOWLEDGMENTS I want to express my gratitude to Lisa Waxman for her unflagging enthusiasm and sharp attention to detail. I also wish to thank the other members of my committee, Peter Munton and Rick Navarro for taking the time to read my thesis and offer a very helpful critique. I want to acknowledge the support received from my Mom and Dad, whose faith in me helped me get through this. Finally, I want to thank my son Jack, who despite being born as my thesis was nearing completion, saw fit to spit up on the manuscript only once. -
Film Camera That Is Recommended by Photographers
Film Camera That Is Recommended By Photographers Filibusterous and natural-born Ollie fences while sputtering Mic homes her inspirers deformedly and flume anteriorly. Unexpurgated and untilled Ulysses rejigs his cannonball shaming whittles evenings. Karel lords self-confidently. Gear for you need repairing and that film camera is photographers use our links or a quest for themselves in even with Film still recommend anker as selections and by almost immediately if you. Want to simulate sunrise or sponsored content like walking into a punch in active facebook through any idea to that camera directly to use film? This error could family be caused by uploads being disabled within your php. If your phone cameras take away in film photographers. Informational statements regarding terms of film camera that is recommended by photographers? These things from the cost of equipment, recommend anker as true software gizmos are. For the size of film for street photography life is a mobile photography again later models are the film camera that is photographers stick to. Bag check fees can add staff quickly through long international flights, and the trek on entire body from carrying around heavy gear could make some break down trip. Depending on your goals, this concern make digitizing your analog shots and submitting them my stock photography worthwhile. If array passed by making instant film? Squashing ever more pixels on end a sensor makes for technical problems and, in come case, it may not finally the point. This sounds of the rolls royce of london in a film camera that is by a wide range not make photographs around food, you agree to. -
Sample Manuscript Showing Specifications and Style
Information capacity: a measure of potential image quality of a digital camera Frédéric Cao 1, Frédéric Guichard, Hervé Hornung DxO Labs, 3 rue Nationale, 92100 Boulogne Billancourt, FRANCE ABSTRACT The aim of the paper is to define an objective measurement for evaluating the performance of a digital camera. The challenge is to mix different flaws involving geometry (as distortion or lateral chromatic aberrations), light (as luminance and color shading), or statistical phenomena (as noise). We introduce the concept of information capacity that accounts for all the main defects than can be observed in digital images, and that can be due either to the optics or to the sensor. The information capacity describes the potential of the camera to produce good images. In particular, digital processing can correct some flaws (like distortion). Our definition of information takes possible correction into account and the fact that processing can neither retrieve lost information nor create some. This paper extends some of our previous work where the information capacity was only defined for RAW sensors. The concept is extended for cameras with optical defects as distortion, lateral and longitudinal chromatic aberration or lens shading. Keywords: digital photography, image quality evaluation, optical aberration, information capacity, camera performance database 1. INTRODUCTION The evaluation of a digital camera is a key factor for customers, whether they are vendors or final customers. It relies on many different factors as the presence or not of some functionalities, ergonomic, price, or image quality. Each separate criterion is itself quite complex to evaluate, and depends on many different factors. The case of image quality is a good illustration of this topic. -
Seeing Like Your Camera ○ My List of Specific Videos I Recommend for Homework I.E
Accessing Lynda.com ● Free to Mason community ● Set your browser to lynda.gmu.edu ○ Log-in using your Mason ID and Password ● Playlists Seeing Like Your Camera ○ My list of specific videos I recommend for homework i.e. pre- and post-session viewing.. PART 2 - FALL 2016 ○ Clicking on the name of the video segment will bring you immediately to Lynda.com (or the login window) Stan Schretter ○ I recommend that you eventually watch the entire video class, since we will only use small segments of each video class [email protected] 1 2 Ways To Take This Course What Creates a Photograph ● Each class will cover on one or two topics in detail ● Light ○ Lynda.com videos cover a lot more material ○ I will email the video playlist and the my charts before each class ● Camera ● My Scale of Value ○ Maximum Benefit: Review Videos Before Class & Attend Lectures ● Composition & Practice after Each Class ○ Less Benefit: Do not look at the Videos; Attend Lectures and ● Camera Setup Practice after Each Class ○ Some Benefit: Look at Videos; Don’t attend Lectures ● Post Processing 3 4 This Course - “The Shot” This Course - “The Shot” ● Camera Setup ○ Exposure ● Light ■ “Proper” Light on the Sensor ■ Depth of Field ■ Stop or Show the Action ● Camera ○ Focus ○ Getting the Color Right ● Composition ■ White Balance ● Composition ● Camera Setup ○ Key Photographic Element(s) ○ Moving The Eye Through The Frame ■ Negative Space ● Post Processing ○ Perspective ○ Story 5 6 Outline of This Class Class Topics PART 1 - Summer 2016 PART 2 - Fall 2016 ● Topic 1 ○ Review of Part 1 ● Increasing Your Vision ● Brief Review of Part 1 ○ Shutter Speed, Aperture, ISO ○ Shutter Speed ● Seeing The Light ○ Composition ○ Aperture ○ Color, dynamic range, ● Topic 2 ○ ISO and White Balance histograms, backlighting, etc. -
Explicit Image Detection Using Ycbcr Space Color Model As Skin Detection
Applications of Mathematics and Computer Engineering Explicit Image Detection using YCbCr Space Color Model as Skin Detection JORGE ALBERTO MARCIAL BASILIO1, GUALBERTO AGUILAR TORRES2, GABRIEL SÁNCHEZ PÉREZ3, L. KARINA TOSCANO MEDINA4, HÉCTOR M. PÉREZ MEANA5 Sección de Estudios de Posgrados e Investigación 1Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad Culhuacan Santa Ana #1000 Col. San Francisco Culhuacan, Del. Coyoacán C.P. 04430 MEXICO CITY [email protected], [email protected], [email protected], [email protected], [email protected] Abstract: - In this paper a novel way to detect explicit content images is proposed using the YCbCr space color, moreover the color pixels percentage that are within the image is calculated which are susceptible to be a tone skin. The main goal to use this method is to apply to forensic analysis or pornographic images detection on storage devices such as hard disk, USB memories, etc. The results obtained using the proposed method are compared with Paraben’s Porn Detection Stick software which is one of the most commercial devices used for detecting pornographic images. The proposed algorithm achieved identify up to 88.8% of the explicit content images, and 5% of false positives, the Paraben’s Porn Detection Stick software achieved 89.7% of effectiveness for the same set of images but with a 6.8% of false positives. In both cases were used a set of 1000 images, 550 natural images, and 450 with highly explicit content. Finally the proposed algorithm effectiveness shows that the methodology applied to explicit image detection was successfully proved vs Paraben’s Porn Detection Stick software. -
Basic Sensitometry and Characteristics of Film Basic Sensitometry and Characteristics of Film
BASIC SENSITOMETRY AND CHARACTERISTICS OF FILM BASIC SENSITOMETRY AND CHARACTERISTICS OF FILM BASIC PHOTOGRAPHIC SENSITOMETRY Sensitometry is the science behind the art of filmmaking. It is the measurement of a film’s characteristics. These measurements are expressed in numeric and chart form to convey how a film will react to the amount of light, the type of lighting, the amount of exposure, the type of developer, the amount of development, and how all these factors interact. In most cases, a cinematographer doesn’t need a great depth of technical information to use motion picture films—using the right film speed and the right process will suKce. On the other hand, having a basic understanding of film sensitometry will help you in tasks as simple as film selection to as complicated as communicating the mood of a challenging scene. THE CHARACTERISTIC CURVE At the heart of sensitometry is the characteristic curve. The characteristic curve plots the amount of exposure against the density achieved by that exposure: 3.0 2.8 2.6 2.4 Shoulder 2.2 2.0 1.8 Y Straight Line T 1.6 I S 1.4 N E D 1.2 1.0 Base-Plus-Fog or 0.8 Gross-Fog Density 0.6 Toe 0.4 0.2 0.0 3.0 2.0 1.0 0.0 1.0 2.0 LOG EXPOSURE To create a characteristic curve, we first need some densities to plot, and they come from a sensitometric tablet exposed onto the film. Commonly called a step tablet, this highly calibrated tool consists of 21 equally spaced intervals of grey. -
Computational RYB Color Model and Its Applications
IIEEJ Transactions on Image Electronics and Visual Computing Vol.5 No.2 (2017) -- Special Issue on Application-Based Image Processing Technologies -- Computational RYB Color Model and its Applications Junichi SUGITA† (Member), Tokiichiro TAKAHASHI†† (Member) †Tokyo Healthcare University, ††Tokyo Denki University/UEI Research <Summary> The red-yellow-blue (RYB) color model is a subtractive model based on pigment color mixing and is widely used in art education. In the RYB color model, red, yellow, and blue are defined as the primary colors. In this study, we apply this model to computers by formulating a conversion between the red-green-blue (RGB) and RYB color spaces. In addition, we present a class of compositing methods in the RYB color space. Moreover, we prescribe the appropriate uses of these compo- siting methods in different situations. By using RYB color compositing, paint-like compositing can be easily achieved. We also verified the effectiveness of our proposed method by using several experiments and demonstrated its application on the basis of RYB color compositing. Keywords: RYB, RGB, CMY(K), color model, color space, color compositing man perception system and computer displays, most com- 1. Introduction puter applications use the red-green-blue (RGB) color mod- Most people have had the experience of creating an arbi- el3); however, this model is not comprehensible for many trary color by mixing different color pigments on a palette or people who not trained in the RGB color model because of a canvas. The red-yellow-blue (RYB) color model proposed its use of additive color mixing. As shown in Fig. -
Switchable Primaries Using Shiftable Layers of Color Filter Arrays
Switchable Primaries Using Shiftable Layers of Color Filter Arrays Behzad Sajadi ∗ Kazuhiro Hiwadaz Atsuto Makix Ramesh Raskar{ Aditi Majumdery Toshiba Corporation Toshiba Research Europe Camera Culture Group University of California, Irvine Cambridge Laboratory MIT Media Lab RGB Camera Our Camera Ground Truth Our Camera CMY Camera RGB Camera 8.14 15.87 Dark Scene sRGB Image 17.57 21.49 ∆E Difference ∆E Bright Scene CMY Camera Our Camera (2.36, 9.26, 1.96) (8.12, 29.30, 4.93) (7.51, 22.78, 4.39) Figure 1: Left: The CMY mode of our camera provides a superior SNR over a RGB camera when capturing a dark scene (top) and the RGB mode provides superior SNR over CMY camera when capturing a lighted scene. To demonstrate this, each image is marked with its quantitative SNR on the top left. Right: The RGBCY mode of our camera provides better color fidelity than a RGB or CMY camera for colorful scene (top). The DE deviation in CIELAB space of each of these images from a ground truth (captured using SOC-730 hyperspectral camera) is encoded as grayscale images with error statistics (mean, maximum and standard deviation) provided at the bottom of each image. Note the close match between the image captured with our camera and the ground truth. Abstract ment of the primaries in the CFA) to provide an optimal solution. We present a camera with switchable primaries using shiftable lay- We investigate practical design options for shiftable layering of the ers of color filter arrays (CFAs). By layering a pair of CMY CFAs in CFAs.