How to compute three values of PSNR one for each channel, using RGB image?

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I want to compute PSNR of a watermarked RGB image and original RGB Image. Please help it's for my project.

Accepted Answer

Image Analyst
Image Analyst on 19 Dec 2017
Split the image up into different color channels and use psnr() on each channel:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Extract also for watermarked image, then compute PSNR:
psnrRed = pnr(redChannel, redChannelWatermarked);
psnrGreen = pnr(greenChannel , greenChannelWatermarked);
psnrBlue = pnr(blueChannel , blueChannelWatermarked);
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