How invert only one colour in RGB image?

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Pavel M 2022-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/1688514-how-invert-only-one-colour-in-rgb-image

编辑： Pavel M 2022-4-5

采纳的回答： DGM

Hello!

I want to change background in my rgb image from black to white. How I can do it without inversing others colours?

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Pavel M 2022-4-4

For the beginning i wanted to invert black to white.

For the second, after inverting i want to do numbers on scales x and y more clear

Pavel M 2022-4-4

It is ideal variant

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DGM 2022-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/1688514-how-invert-only-one-colour-in-rgb-image#answer_934704

在 MATLAB Online 中打开

The easy way to do this is L inversion. You can do this the hard way, or you can just use MIMT tools:

inpict = imread('scope.png');
outpict = imtweak(inpict,'hsl',[0 1 -1]); % invert L
imshow(outpict)

Of course yellow on white is hard to read, so desaturating might help.

inpict = imread('scope.png');
outpict = imtweak(inpict,'hsl',[0 0.7 -1]); % invert L, reduce S
imshow(outpict)

Otherwise, you could always try to mask off certain parts of the image and adjust them independently.

Imtweak() is part of MIMT, and is available at the link above.

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DGM 2022-4-5

在 MATLAB Online 中打开

scopemask.png

I'm assuming you're after the floating toolbar things. This is one example. I can't really provide an example of the mask generation, since I did that by manual selection. I attached the mask image.

inpict = imread('scope.png');
% mask created by manual selection using immask() in HSV
mk = imread('scopemask.png');
mk = imfill(mk,'holes'); % fill in holes
% adjust the whole image
outpict = imtweak(inpict,'hsl',[0 0.7 -1]); % invert L, reduce S
% but use the mask to revert the selected areas
outpict = replacepixels(inpict,outpict,mk);
imshow(outpict)