On Mon, Jan 30, 2012 at 9:50 PM, Michael Sweet wrote: > Sounds like we should have a screen calibration program on Linux then - it > is easy enough to do one that doesn't require hardware, and (for example) > we've had this on Mac OS X for years. The simple profile setup just has the > user (effectively) pick a gamma value by looking at a test image with 50% > gray and 50% black/white and moving a slider to match them up. The advanced > version does multiple test images and has a 2D control to adjust the > neutrality of the gray. We already have such an application. It's called LProf and uses gamma and black level chart from Norman Koren for creating naive ICC profiles. It's not really maintained, but it exists, builds and works. Alexandre Prokoudine http://libregraphicsworld.org