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How to change selected pixels color value to 0?

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Simaa
Simaa 2022-8-28
回答： Chunru 2022-8-29
Hello,
I need to select pixels interactively from the image and change values to 0.
[filename, pathname] = uigetfile({'*.*';'*.bmp';'*.png';'*.jpg';'*.gif'}, 'Pasirinkite faila');
Image = imread([pathname,filename]);
pval=impixel(Image);
This way I can see selected pixels values:
pval =
231 71 115
207 0 70
249 12 84
115 32 42
How can I change those exact values to zero?
The point is to change selected color to black.
Thanks for your help!

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采纳的回答

Chunru
Chunru 2022-8-29
Ran in:
% Get an indexed image
Im = imread("peppers.png");
[Im, cmap] = rgb2ind(Im, 256);
%whos
Name Size Bytes Class Attributes Im 384x512 196608 uint8 cmap 256x3 6144 double cmdout 1x33 66 char
pval = [
231 71 115
207 0 70
249 12 84
115 32 42];
for i=1:numel(pval)
Im(Im==pval(i)) = 0;
end
imshow(Im, cmap)

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