These charts can be generated programmatically or manually, using the Standard Observer data, converted from XYZ to sRGB or AdobeRGB. That gives you only the spectrum locus shape. And it also gives you the "clipping" information, so you get the exact gamut extent of either spaces. To calculate the inside of the horseshoe, though, some additive color mixing is necessary, to calculate the resultant chromaticity coordinates and then, you can compute the RGB values for plotting inside Illustrator or whatever other graphic utilities. Maybe Graeme has a ready-made utility that does the trick in one keystroke? I've seen this done, once, at the National Research Center in Ottawa, but I never bothered to ask the programmer for his code. I wonder if it could be done using Excel? Come to think of it, Matlab may already have a command to do just that already? Or even Mathematica. I remember seeing, not long ago, some kind of demonstration routine that drew the chromaticity diagram right on my PC, with their free demo Wolfram Research application? This is something I'd like to do programmatically, some day, but always end up having something more urgent to do. Best / Roger From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx] On Behalf Of Kris Jensen Sent: September-24-11 10:23 AM To: argyllcms@xxxxxxxxxxxxx Subject: [argyllcms] Color space charts Hi everyone, Not really argyll related (my appologies) but this is the most focused group imaginable for answers on the subject. I am looking for good quality, public domain CIE 1931 chromaticity diagrams for sRGB and Adobe RGB for use in a photography text about color. Is there a program in any of the linux repositories that can generate good quality ones? So far I have only been able to take screenshots of the profile viewer for the draft copy but am looking for something better. Kindest regards, Kristofor