Hello, I want to do an unsupervised classification and want to mask out certain areas that have no vegetation. I have these no vegetation areas in a evf. file. When I open the unsupervised classification for ISO I can put in select by subset BUT than it will only analyze the evf ROI and that's the opposite of what I want to do. When I hit mask band, the same thing happens it analyse only the areas in the evf file. How can I analyse all areas in the image EXCEPT for the areas in the evf file? Thank you. Colibri