Hello, I have a problem with a raster in ENVI. To explain the problem, let's assume I have 2 raster (same extent and cell size, TIFF, integer, 8 bit, nodata-values 255). With those raster, I can work perfectly well in ENVI. Then I perform some raster math in ArcGIS: raster3 = float(raster1) / float(raster2) [pseudocode] The resulting raster3 is floating point, 32 bit, nodata-values -3.40282346639e+038, and everything is displayed perfectly well in ArcGIS. However, when I display this raster3 in ENVI, it shows nodata-values as black, and everything else as white. Quick stats produce this: Basic Stats Min Max Mean Stdev Band 1 ********************** 0.593220 ********************** ********************** Histogram DN Npts Total Percent Acc Pct Band 1 ********************** 195584 195584 4.3629 4.3629 Bin=******* ********************** 0 195584 0.0000 4.3629 ********************** 0 195584 0.0000 4.3629 ********************** 0 195584 0.0000 4.3629 ********************** 0 195584 0.0000 4.3629 ********************** 0 195584 0.0000 4.3629 ********************** 0 195584 0.0000 4.3629 [...] ********************** 0 195584 0.0000 4.3629 0.000000 4287316 4482900 95.6371 100.0000 Is it right to assume that ENVI doesn't understand nodata-values in floating point raster? How could I solve this problem? Thanks for all answers! :)