Code for making a reddish image from an RGB image
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Image Analyst on 3 Jan 2014
Walter gave one way, which is to convert it to a grayscale image and then make that into a red image. Another alternative is to just extract the red channel from the RGB image,
redChannel = rgbImage(:,:,1);
redImage = cat(3, redChannel, zeros(size(redChannel), 'uint8'), zeros(size(redChannel), 'uint8'))
or zero out the green and blue channels
redImage = rgbImage; % Initialize
redImage(:,:,2:3) = 0; % Erase green and blue channels.
The above two ways will give you a different image than via Walter's method. Use whichever gives you the image you want (a monochrome/weighted image or the red channel-only image). If you don't know why they're different, or what I'm talking about, then ask.
DGM on 24 Apr 2022
I've answered a couple very similar-sounding questions recently:
How to make image "yellowish"? (explaining 'screen' blend, alternatives with imblend & MIMT tools)
How do I make image "reddish"? (basic non-MIMT blends, opacity comp, HSV colorize, Y+R)
This is also probably tangential to equally vague requests to colorize grayscale images: