How can I convert my image to a red image

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rama
rama 2022-12-13
回答： DGM 2022-12-13
this is my code:
function redImage(app, event)
a=getappdata(0,'a');
red=a;
red(:,:,2:3)=0;
setappdata(0,'filename',red);
imshow(red,'Parent',app.UIAxes2);
end

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DGM
DGM 2022-12-13
Ran in:
That would work if you wanted a red image. It would even work if your input image were single-channel.
inpict = imread('cameraman.tif'); % MxNx1
inpict(:,:,2:3) = 0; % create red image by implicit expansion
imshow(inpict)
... but it wouldn't work if you wanted to do a green or blue image using the same method.
inpict(:,:,[1 3]) = 0; % create green image the same way?
imshow(inpict) % it's black because we just zeroed channel 1
See this thread:
https://www.mathworks.com/matlabcentral/answers/1876382-hi-so-im-changing-the-color-of-the-image-to-green-and-blue-but-its-not-working-one-of-them-gives-an

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