Gray(scale) image with a colormap - how to turn into double?
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Hi,
I have an 8-bit image that consists only of gray colors. On checking the characteristics of the image in Matlab with imfinfo, it turns out that it is ColorType "indexed" and has a colormap of 256x3. I would like to transform this image into a simple grayscale image of a n x m matrix (according to its size) class double.
The function ind2gray demands a colormap and using the colormap of this image didn't work on my end. Probably I'm doing something wrong.
Any help is much appreciated.
I'm struggling finding a solution.
Thanks
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David Young
2015-7-30
编辑：David Young
2015-7-30
This works OK:
[imInd, cmap] = imread('10.bmp');
imGrayUint8 = ind2gray(imInd, cmap);
imGrayDouble = im2double(imGrayUint8);
imshow(imGrayDouble);
3 个评论
John Kau
2015-7-30
Image Analyst
2015-7-31
What did you do when you said "The function ind2gray demands a colormap and using the colormap of this image didn't work on my end"? Because that is exactly what David did. And casting to double shouldn't really be necessary.
MatlabEnthusiast
2019-12-22
hello. now how do you regain the rgb image from the double image?
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