how to apply dct code on each color plane of an RGB image

2015 1 7
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更新时间：2015 1 7
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i understand how to separate a 3d color image into its rgb color planes written below but how to apply the dct to each plane?
% Extract the individual red, green, and blue color channels.
R= rgbImage(:, :, 1);
G= rgbImage(:, :, 2);
B= rgbImage(:, :, 3);

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