Still trying to solve the monitor calibration problem — need to measure the actual spectral output of my monitor's primaries, not just RGB. The CR30 held against the screen gives something, but it's not designed for emissive sources. What I need is the pocket jewel spectroscope I've been using all along, properly …

The plan from the CR30 teardown: print a set of known color patches, measure each with the CR30, and use ArgyllCMS to build a correction profile. Simple in theory. In practice it took two completely different approaches before I got anything usable. What ArgyllCMS expects ArgyllCMS can generate a target chart — a grid …