I study ILWIS for my scientific activities and passed through your
lessons (ilwis_3_0_User_guide.pdf) 1-6 now, and did not met problems
with excesses based on your guide data. But, in your examples all
Landsat (Tmb1-7) raster images have Image domain with 0-255 range. I
not find in your guide (and in Internet too) how to convert Landsat 8
16-bit data to 8-bit format (which can be presented as 0-255 RGB
colors) to repeat your lessons with real Landsat 8 .TIF format images.
After Import -> Map (ILWIS 3.3) procedure I have Value domain for
imported image ranged 0-32765.
Can you explain (or send a reference on methodology), please, how to
receive 8-bit image (or send a reference on methodology)?