How to change the color of a 16bit image from Grays to a color mode?

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Shirley
Shirley 2019-9-12
评论： Shirley 2019-9-17
Hi
I have an image which is 16bit. It is grays. I wonder how can I change it to a specific color, e.g, Yellow? I tried to convert it to RGB first, but somehow [I,map]=imread(16bitimage) doesn't give the colormap.
Thanks a lot

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Shirley
Shirley 2019-9-12
编辑：Walter Roberson 2019-9-12
I found that this works for me. Suggestions are more than welcome. Thanks
1)self define a colormap, e.g
%Yellow [1 1 0]
YellowColormap=zeros(256,3);
for i=1:256
YellowColormap(i,1) = (i-1)/256;
YellowColormap(i,2) = (i-1)/256;
end
2)X=imread(16bit image);
imshow(X,'DisplayRange',[0 65535],'Colormap',YellowColorMap)

更多回答（1 个）

Walter Roberson
Walter Roberson 2019-9-12
image_as_rgb = repmat(image_as_gray, [1 1 3]);
Now you can manipulate image_as_rgb .
Or you might prefer to use ind2rgb() -- though to do that you need to define a colormap that has as many entries as max(image_as_gray)+1, which for a 16 bit image could be as many as 65536 entries.
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Walter Roberson
Walter Roberson 2019-9-15
yellow_image = cat(3, repmat(mat2gray(image_as_gray), [1 1 2]), zeros(size(image_as_gray)));
imshow(yellow_image)
You have a uint16 image, but your data range is only a small fraction of uint16.

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