2009/10/13 Graeme Gill <graeme@xxxxxxxxxxxxx> > Does this happen when you run dispcal from the command line ? The crash during profile generation with version 1.1 happens when I start it from the command line as well (the last lines that are printed to the screen are: About to optimise input, matrix and output together 100% About to adjust a and b output curves for white point About to create grid position input curves ~1 Doing extra fitting! ~1 Doing extra fitting! ~1 Doing extra fitting! ) I followed Nikolay's advice and used version 1.0.4 to create the profile and this worked (thanks Nikolay!). The other problem I noticed (several patches displaying repeatedly while the patch counter goes up, then the patch counter staying the same and patches changing colour during calibration) is hard to reproduce. I am not sure if it happened this time again. The calibration file does not show any two lines with identical values, so maybe everything works as intended and I was seeing things... Anyhow, now that the profile generation works (using version 1.0.4), I have another question: When I take a look at a gradient image in photoshop that goes through all the colours at full saturation (from red to green to blue to red again with the secondary colours in between) in a document that is in prophoto colour space the whole gradient is pretty uniform and seems to go to the maximum saturation as expected, except for a stripe around maximum blue saturation. There it drops off in brightness and saturation and this is by far the most non-uniform area. In a smaller colour space like adobe rgb everything is fine. I assume that this is because the prophoto colour space extends outside the famous horseshoe of visible colours, correct? But what I find strange is that it doesn't get mapped into the most saturated blue range but instead to a visibly darker and (maybe) less saturated area. Is there a way around this issue? Is this an issue of photoshop? Or is this transformation more complicated that it seems to a novice in colour transformation like me? Overall the profile and calibration obtained using argyllcms seam to be a lot better than those generated by the spyder 3 pro calibration software. Thanks for making argyllcms :) Daniel