How to Store this attached rgbimage with a colormap. I tried the following code but could not write the image with colormap.
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ANITA JASMINE
le 27 Fév 2020
Commenté : ANITA JASMINE
le 2 Mar 2020
I tried the following code to write the image with map. But again the colormap is null.
[img, map] = imread('1.jpg');
map = []
>> [indimg,map1] = rgb2ind(img,32);
>> imwrite(indimg,map1,'new.jpg');
>> [img, map] = imread('new.jpg');
>> map
map = []
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Subhadeep Koley
le 1 Mar 2020
Your are writing the image in JPEG format and imwrite converts indexed images to RGB before writing data to JPEG files, because the JPEG format does not support indexed images.
Use the code below
[img, ~] = imread('yourImage.jpg');
[ind1, map1] = rgb2ind(img, 32);
imwrite(ind1, map1, 'yourImageNew.png'); % Don't change the extension to .jpg or .jpeg
[img2, map2] = imread('yourImageNew.png');
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