apply transparency black pixels mapshow

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fransec
fransec 2020-3-27
Hi Everybody.
I have to produce an image with mapshow command, for then exporting on Google Earth.
figure
axesm eqdcylin
mapshow((ax),(ay),(z),'DisplayType','texturemap');
set(gca,'Xlim',[nanmin(ax(:)) nanmax(ax(:))]);
set(gca,'Ylim',[nanmin(ay(:)) nanmax(ay(:))]);
set(gca,'colormap', hot)
export_fig -r800 -a1 figexample.png
The result is here:
How can I apply transparency just to the black pixels and not to the red/yellow/orange ones? Just I need an alpha parameter?
Thank you so much!

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