Problems using geotiffwrite with colormap
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Amit Kallush
on 14 Feb 2023
Commented: Amit Kallush
on 20 Feb 2023
I have a .png file and his associated .wld file. I’m using “imread” and “worldfileread” to load both files into Matlab and write them back in “tif” format.
It’s working great, but the file is saved without a color map. So I tried to load the original color map and save it together, but for some reason, I get the error:
Error using geotiffwrite
Function GEOTIFFWRITE expected its third input argument CMAP to be a valid colormap. Valid colormaps must be nonempty, double, 2-D matrices with 3 columns.
As far as I can see, the cmap is a double, 2-D matrix with 3 columns.
Maybe somebody has a solution for that?
The files and script are attached.
Thanks!
[image,cmap] = imread('ABX_N0Q_202109290033.png');
R = worldfileread('ABX_N0Q_202109290033.wld',"geographic",size(image));
geotiffwrite('test.tif', image, R,cmap);
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Accepted Answer
Yuvraj Singh
on 20 Feb 2023
Hi Amit,
geotiffwrite('test.tif', image, R,cmap);
'geotiffwrite' expects its third argument to be cmap, in the code mentioned above cmap is the fourth argument.
Refer to the below documentation for the right syntax.
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