MATLAB: Need to color a specific pixel on a uint8 image

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Title is pretty self explanatory. I have an image (which is all grey) in uint8 format, and I want to color in specific pixels with the standard red, green, blue, etc colors. I am stuck on how to convert specific colors like colors('r') into a format that is compatible with the uint8 image.

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See attached demos.

Related Solutions

MATLAB: Uint16 to uint8

u16 = your uint16 variable
u8 = typecast(u16,'uint8');

MATLAB: Converting HEX to uint8

Try to reshape it first. You of course only want to send in 2hex at a time since the largest unit8 is 255. Try this,

 hexstring = 'aabbccddee';
 reshapedString = reshape(hexstring,2,5);
 hexMtx = reshapedString.';
 disp(hexMtx);
 decMtx = hex2dec(hexMtx);
 disp(decMtx);
 intVector = uint8(decMtx);
 disp(intVector);

This will give you an uint8 column vector. If you want it as a string format (the uint8 vector) then do,

 intString = num2str(intVector');
 intString = strrep(intString,' ','');

Good luck and comment if questions.

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Related Solutions

MATLAB: Uint16 to uint8

MATLAB: Converting HEX to uint8

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