05-29-2018, 06:28 AM
The problem with the linear histogram if that the most frequent value is 1. If you have a white background, 50% of your pixels are white. The other 255 values are usually at best at 2%, so hardly visible (1/50th of the total height). For the difference with RT, one explanation could be that Gimp is showing you the gamma-corrected histogram (the other pair of icons, next to linear/log).