In my classified raster image I have 3 different green colors and there are also other colors in the image. I would like to remove the green areas or make them transparent. Is there a way to do this automatically for multiple images?
Best answer by gio
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+17
Can you define the "green" with some specific R, G, B values or ranges of R, G, B?
+3
@fluusha
You can remove or replace colors using a rasterexpression evaluator.
4 expressions, one to grab the colors and replace with transparency channel and 3 to "preserve" the rest.
Like this.
Here green RGB 153,192,30 is removed and replaced by full transparency.
Turning
in
You can have it read content of a folder dynamically and process the images in those folders.
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