Digital Imaging Alliance
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1 Digital Imaging Alliance 1
2 2
3 Camera Calibration & Profiling Little Things Matter! Minor improvements can contribute! toward our quest for perfection! 3
4 Camera Calibration & Profiling What"s the problem?! The scanning back is an extremely accurate & precise digital capture device and the owners are a higher echelon of image makers who demand quality and perfection beyond the expectations of the majority.! However most equipment and software are designed to meet the needs of the masses.! 4
5 Camera Calibration & Profiling What is the profile intended to do?!! Each digital device will display color differently.! The profile is a description of how each of these devices will reproduce color. The camera profile describes the way color # is reproduced by a specific combination # of spectral capture conditions.! 5
6 Camera Calibration & Profiling But a bad profile can be worse# than none at all! If struggling use Adobe RGB 1998 in ViewFinder and as the working color space in Photoshop and make your selective color edits as needed. 6
7 Camera Calibration & Profiling Robin"s Rules:! You cannot cheat the! Laws of Physics!! 7
8 Camera Calibration & Profiling Bad Information! Early recommendations to manipulate grey values to match chart target values. 8
9 Camera Calibration & Profiling The practical application of profiles! Our objective is to minimize the variables to get repeatable & satisfactory reproduction of the original. 9
10 Camera Calibration & Profiling The practical application of profiles! Our objective is to minimize the variables to get repeatable & satisfactory reproduction of the original. 1 0
11 Camera Calibration & Profiling Our Objective! To prevent any capture errors or variables! from contaminating profile results and! to get MOST scans as accurate as possible! to minimize labor and proofing runs." 1 1
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13 Camera Calibration & Profiling Known Problems & Issues of Confusion! Light Falloff Lens and Lighting! Variables in Contrast in Chart Capture! Exposure Errors! Veiling Glare! Chart Selection! Misunderstanding Profile Software! Isolation of Profile and Tone Curve! Lack of Consistency and Attention to Detail! Quality Instead of Quality One Good Profile! 1 3
14 Put Lines on floor at 90 and 45 to have reference angle for light and camera positions and marks at 1 f-stop increments. 1 4
15 ! Setup height of lights and lens to center of easel! Position camera for largest piece of the session! Set lens to working aperture and use Repro 2.2 curve 1 5
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17 Think Green!! All of our reference numbers refer to Green Channel values! Values printed in Repro Curve White Paper on Better Light website 1 7
18 ! Use a black surround behind the color chart to kill reflecting light! Use the longest lens you have to minimize veiling glare on the edges! Use bellows lens shades and/or gobos to shield stray light from the lens 1 8
19 1 9
20 Camera Calibration & Profiling Cosine Fourth Lens Falloff! 2 0
21 Camera Calibration & Profiling INVERSE SQUARE LAW! DOUBLE THE DISTANCE = OPEN 2 F-STOPS! Therefore: HALF THE DISTANCE = CLOSE 2 F-STOPS And: ONE QUARTER THE DISTANCE = CLOSE 1 F-STOP 2 1
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23 ! With a White Card on your Copy Board! Make a Prescan! Select TONE ZONES from top menu bar! Use preset Zones or make your own! Adjust ISO or Line Time to change Histogram 2 3
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41 Capture Recommendations! MORE DATA! Use 16-bit files when possible! MB (16-bit) file! 4 1
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49 Camera Calibration & Profiling Optimizing the Chart Capture! Adjust Lights for Evenness ( Flat-fielding )! Set Tone Curve and Neutral Balance! Set Exposure and Minimize Noise! Image Color Chart and White Card (optional)! Dust Color Chart and White Card Images! Adjust Chart Image with EquaLight (optional)!! Make the ICC Profile! Add ICC Profile to ViewFinder! Adjust Tone Curve for Desired Subject Rendering 4 9
50 Camera Calibration & Profiling Best Practices! Shoot the color charts for profiles like a separate project so you can take careful steps to make the best possible profile.! Take the time to get even Illumination and/or use EquaLight correction for perfect evenness across chart. Watch white values especially if using EquaLight.! For exposure place white patch in the brightest part of the!scene to prevent errors in exposure and causing an increase from EquaLight processing. Especially when using texture lighting.! Setup conditions for minimal image noise. Use the lowest ISO and the fastest practical Line Time to reduce noise. In difficult conditions such as cross-polarization, multiple scans of identical setup can be made and averaged in Photoshop 4 scans averaged will reduce noise by 50%. 5 0
51 Camera Calibration & Profiling Best Practices! Use the SG Chart for profiling. It reduces the average color error by HALF compared to ColorChecker because of more colors for a more accurate algorithm.! A Profile for each Spectral difference. A new profile for Polarized lighting, Daylight vs. Tungsten IR filters, Diffusers added, etc.! Don"t edit tone values on the chart before making the profile you are giving false data to the software and it will make up for the errors in the capture. Use the Repro 2.2 curve. 5 1
52 Camera Calibration & Profiling Best Practices! To facilitate subsequent color editing, conversion into the RGB!working space is recommended. The profile has done its job in optimizing color, so best to get rid of any influence the profile may have on future curve or color adjustments and other edits.! Profiles have a long life remains just as good as long as nothing related to the spectrum changes (assuming you are happy with the results).! Keep some of your previous OK profiles sometimes they provide a better starting point to certain images. 5 2
53 Camera Calibration & Profiling The Truth Hurts! A profile will NOT be perfect# in rendering all colors all the time! 5 3
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