On Tue, 21 Jan 2003 18:48:39 -0800, larry@xxxxxxxxx said: > The default histogram display seems wrong in Gimp, by the standards of > photoshop and a number of other image management programs. There is a > link below to an image demonstrating what I mean. (I am cross-posting > this to Filmgimp, because there seems to be common histogram code). > > An optional plug-in for Gimp called "Color Correction" seems to do > histograms the way I would expect, i.e., giving meaningful feedback to > determine (about a photograph) whether the exposure was well chosen, and > serving as a useful guide for correction using levels and curves. > > Take a look at this image to see how Gimp's main histogram display > compares with the Color Correction plug-in's. > > http://www.marso.com/images/example.jpg This is something I brought up some time ago (see http://lists.xcf.berkeley.edu/lists/gimp-developer/2001-February/004518.html). The Gimp uses logarithmic scaling, while other image processing tools I know use another kind of scaling -- I thought linear, but sqrt has also been suggested. At first I didn't like the way the Gimp does it, because I think it doesn't look pretty. But then I started to think that logarithmic scaling actually isn't so bad for these kinds of things. Best regards, Roel Schroeven -- "Codito ergo sum" Roel Schroeven
