The CLUT menu provides sliders
for contrast adjustment.
Notes about other software:
- ImageJ, Image / Adjust / Brightness & Contrast allows
increase and decrease of contrast, but not reversal. Use Image
/ Lookup Tables / Invert LUT to reverse the contrast.
- Photoshop, Image / Adjust / Levels allows contrast increase,
decrease and reversal. The outer two of the upper sliders (see picture
of the levels dialog) increase the
contrast. The middle one of these adjusts the gamma. The two sliders
below the output levels bar decrease the contrast.