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Imatest Documentation R/B Color shading, exaggerated color. The second example shows the difference between the Red and Blue channels in f-stops with a pseudo color background. Plotted results have been normalized to a maximum of 0 f-stop difference. R-B (difference) color shading, pseudocolor. Color nonuniformity can be displayed as one of the L*a*b* color difference metrics (∆E = sqrt(∆L* 2 + ∆a* 2 + ∆b* 2 ), ∆C = sqrt(∆a* 2 + ∆b* 2 ), ∆E94, ∆C94, ∆E00, ∆C00 ), referred to the center of the image (either the central region, with size specified in 338 of 451
Imatest Documentation the Corner and side regions box or the central 25% by area). The ∆C metrics are of particular interest for color metrics because they omit luminance differences (∆L*). It is displayed below as a 3D plot, which can be rotated for enhanced visualization.. Uniformity profiles (Imatest Master only) Uniformity profiles displays profiles of image levels along several lines: Diagonal Upper Left-Lower Right, Diagonal Lower Left-Upper Right, Vertical Top-Bottom (center), and Horizontal Left-Right (center). Several display options are listed below. RGBY unnormalized (max 1) RGBY unnormalized pixels (max 255) RGBY normalized (max 1) Ratios: R/G, B/G (G constant) RGBY normalized: ALL CHANNELS Delta L* a* b* C* (C* = chroma) The independent axis goes from 0 to 1 in steps of 0.025 (41 steps total). Detailed results for the 41 steps are written to the CSV and XML output files. Polynomial fit A fourth order fit to R, G, B, and Y (or L*, a* and b*) is shown as faint dotted lines in the upper (Diagonal UL-LR) plot. The equation for the fit is y = c1r 4 + c2r 3 + c3r 2 + c4r + c4 ∆C 2000 color shading (omits ∆L*), 3D shaded pseudocolor. where r is the distance from the center normalized to the Uniformity profiles. center-to-corner distance (r = 1 at the corners). The R, G, B, and Y coefficients are in displayed the CSV and XML output files. There is not enough space to show them in the plot. They have the following format in the CSV output file. Fourth order fit: y = c(1)*r^4 + C(2)*r^3 + ... + c(5) where r is normalized to center-to-corner. R 0.045 -0.108 -0.081 -0.083 0.866 339 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Instructions
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