Apply the "color range" of one grayscale image to another graysacle image

Hi,

I have 2 grayscale images, A and B. A consits of only 8 colors (122 to 129) and B consits of 131 colors (20 to 150).

I would like to apply image A's color range to image B while keeping B's "original relative color range".

Any idea of how to do this?

Many thanks! jk

Answer 1

[Image Analyst]

If you want to squeeze the B image into the range of the A image, you can use imhistmatch(), mat2gray(), or imadjust(), or even simple mathematical scaling manually. For example

minA = min(A(:));
maxA = max(A(:));
newB = (maxA - minA) * mat2gray(double(B)) + minA;
imshow(newB, []); % The [] are needed if you want to see it.

newB is a floating point image. Cast back to uint8 if you want but if you do that, you'll have quantization error.

[John Kau]

Thanks, imadjust seems to do the trick!