Is there a way to select a "data value to ignore" in ENVI ZOOM? I often find myself overlaying georeferenced HSI imagery that has a lot of blank space (filled with zeros) over (say) panchromatic imagery. I would like to be able to "see through" the areas of the HSI image that are zeros, much in the way one can in the mosaic tool in ENVI. Is this possible in ENVI ZOOM? If not, is there an equivalent alternative?