Color Accuracy Presentation - Better Light Inc. PDF
Preview Color Accuracy Presentation - Better Light Inc.
Welcome to the Fifth Almost-Annual Better Light Owners’ Conference …it’s gonna be HOT!! COLOR ACCURACY more than you ever wanted to know - including - how to improve your camera profile “Color Accuracy”… ¬ How accurately does a device render color? ¬ …compared to what? ¬ …under what conditions? ¬ …using what terminology? Spectral response method compares the actual response of a device with its theoretical response, based on spectral data for the reference chart being used, and for the device 1 1.00 0..990 dark brown dark orange blue 0..880 white light brown violet blue 0.7.70 green gray 1 pale blue 0.6.60 mediu m red ccredd red 0.5.50 ccg odrlivae yg 2greeenn ccddar kb plurpele 0.4.40 yelow medium gray light purple 0 0..330 yelow green magenta dark gray 0.20 reference chart spectral data device spectrlighat cylan response data light orange 0.10 cyan 0.1 black 0.00 0 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 530 540 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 Calculated device response to each reference chart color patch: 1.00 0.90 0.80 0.70 red response 0.60 green response blue response 0.50 yellow patch ccd red 0.40 ccd green ccd blue 0.30 area under each response curve represents 0.20 the relative signal level for that color channel 0.10 0.00 380 400 420 440 460 480 500 520 540 560 580 600 620 640 660 680 700 720 This method involves many calculations… …with little surprise the measured response of a Better Light scanning back corresponds very closely to its calculated response 1.00 0.90 0.80 0.70 calc R 0.60 meas R 0.50 but how well does the device responsceaelc G meas G 0.40 calc B 0.30 correspond to a standard response?meas B 0.20 0.10 0.00 white gray1 gray2 med gray dark gray black blue green red yelow magenta cyan dk orange violet blue med red dk purple yel green lt orange dk brown lt brown pale blue olive green lt purple lt cyan What is a standard response? ¬ Characterizing the “native” response of a device is a good first step, but a device should also be capable of rendering colors according to an accepted standard, to provide a “standard response” ¬ This usually involves three-dimensional calculations to convert the device response to a standard response ¬ The above is equivalent to converting from the color space of the device to a standard color space Color space – the final frontier… Adobe RGB 1998 color space displayed by ColorThink Describing color with a 3D space brightest point = white neutrals are at center increasing brightness, decreasing saturation max diameter = max saturation hue increasing brightness, increasing saturation darkest point = black
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