changing colormap of 10000 saved JPEG spectrograms

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Sania Gul
Sania Gul 2022-9-17
评论： Walter Roberson 2022-9-17
I have saved 10000 spectrograms as .jpeg images, in my hard drive, using the default "PARULA" colrmap. I want to change all of them to "AUTUMN" colormap. Is there any way to do that, without redrawing the spectrograms from audio from the scratch?

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Walter Roberson
Walter Roberson 2022-9-17
Use rgb2ind specifying the parabula map. Then ind2rgb that using the other color map.
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Sania Gul
Sania Gul 2022-9-17
Wait, wait, wait. All matrix value of A were laying between 0 to 255 in RGB plane, but the values of C are in range [0:1]. and diplayed as
Although the summer map displays perfectly, but I want it to be stored in range [0:255]. When I did
C=255*ind2rgb(B,out_cmap);
and display it by imshow(C), the result transformed to
Walter Roberson
Walter Roberson 2022-9-17
in_cmap = parula;
out_cmap = autumn;
A = imread(fullfile(SourceFolder1,filenames1(count).name));
B = rgb2ind(A, in_cmap);
C = im2uint8(ind2rgb(B, out_cmap)) ;

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