jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
45 lines
1.3 KiB
Matlab
Executable File
45 lines
1.3 KiB
Matlab
Executable File
% function [xyz] = rgb2xyz(rgb)
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%
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% // C-Code
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% if ( var_R > 0.04045 ) var_R = ( ( var_R + 0.055 ) / 1.055 ) ^ 2.4
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% else var_R = var_R / 12.92
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% if ( var_G > 0.04045 ) var_G = ( ( var_G + 0.055 ) / 1.055 ) ^ 2.4
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% else var_G = var_G / 12.92
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% if ( var_B > 0.04045 ) var_B = ( ( var_B + 0.055 ) / 1.055 ) ^ 2.4
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% else var_B = var_B / 12.92
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%
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% var_R = var_R * 100
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% var_G = var_G * 100
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% var_B = var_B * 100
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%
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% // Observer. = 2°, Illuminant = D65
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% X = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805
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% Y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722
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% Z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505
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%
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% Source http://www.easyrgb.com
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function [xyz] = rgb2xyz(rgb)
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[m,n] = size(rgb);
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if ((m ~= 3) & (n == 3))
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rgb = rgb';
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end;
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% Observer = 2°, Illuminant = D65
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t_mat = [[ 0.412453 0.357580 0.180423 ]
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[ 0.212671 0.715160 0.072169 ]
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[ 0.019334 0.119193 0.950227 ]];
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rgb_k = f1(rgb);
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xyz = t_mat * rgb_k;
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function rgb_k = f1(rgb)
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thresh_n = 0.04045 ;
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[idx_m, idx_n] = find(rgb > thresh_n);
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rgb_k(idx_m,idx_n) = ((rgb(idx_m,idx_n) + 0.055)/1.055).^(2.4);
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[idx_m, idx_n] = find(rgb <= thresh_n);
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rgb_k(idx_m,idx_n) = rgb(idx_m,idx_n)/12.92;
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