Problems using geotiffwrite with colormap

Question

0 个投票

ABX_N0Q_202109290033.zip

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);