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9 MODULES – COLOR
8.3.3.
Numerical results
All values are reported for the whole chart (‘All’) and for patch-groups (‘Color’, ‘Neutral’, ‘Skin’, …) which are defined in the .cref file. Examples of patch-groups:
ColorChecker
ColorChecker ‘All’ ColorChecker ‘Color’ ColorChecker ‘Neutral’
IT8
IT8 ‘All’ IT8 ‘Color’ IT8 ‘Neutral’
ColorChecker SG
ColorChecker SG ‘All’ ColorChecker SG ‘Color’ ColorChecker SG ‘Neutral’
ColorChecker SG ‘CC - CoorChecker’ iQ-Analyzer
ColorChecker SG ‘Skin’
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9 MODULES – COLOR
The numerical results report the values for Delta E, L, C and H and the visual noise (VN) for the three viewing condition sets (defined in the settings).
Delta E: color distance, 1 ∆ E should be visible for a trained person
Delta L:
Delta C: luminance in polar coordinate color space LCH chrominace in polar coordinate color space LCH
Delta H: hue (colortone) in polar coordinate color space LCH
VN Set 1: default: distance to display 0.5 m, fixed resolution of 96 dpi
VN Set 2: default: fixed picture height of 100 mm, viewing distance calculated depending on image diagonal
VN Set 3: fixed oicture height of 400 mm, viewing distance calculated depending on image diagonal
L(level): The average over all patches of L* of the reference and of the image data is calculated. This is used to calculate the
‘L(level)’, the average offset of L* between image and reference. 100% means reference and image data have the same average value.
(included since iQ-Analyzer version 6)
C(level): The average over all patches of C* of the reference and of the image data is calculated. This is used to calculate the ‘C(level)’, the average offset of C* between image and reference. 100% means reference and image data have the same average value. (included since iQ-Analyzer version 6)
∆
E(corrL): The offset L(level) over all patches is subtracted from the individual patch, providing a metric for the offset corrected values. ∆ E_corrL provides the luminance error which is corrected with the average offset of the luminance (L*).
∆
E(corrC): The offset C(level) over all patches is subtracted from the individual patch, providing a metric for the offset corrected values. ∆ E_corrC provides the color error which is corrected with the average offset of the saturation (L*).
∆
E(corrLC): The offsets L(level) and C(level) over all patches are subtracted from the individual patch, providing a metric for the offset corrected values. ∆ E_corrLC provides the luminance and color error which is corrected with the average offset of the luminance
(L*) and saturation {C*). iQ-Analyzer
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