Comment 14 for bug 498029

what difference would that make? Unless you scan a target - you need a pre-printed target to scan it I suppose - then gnome-color-manager has no basis for making a comparison?

Not that I necessarily understand what a color profile is, I'm currently checking the 112-page specification http://www.color.org/ICC1v42_2006-05.pdf to see whether it would be feasible to write a plug-in/app to manually create color profiles from arbitrary files - as most scan software includes at least brightness/contrast/gamma correction, some color curves would potentially be appropriate too?

I'll have to guess that for an OS that 'works' people may need a scanning application that is capable of making adjustments without specialist tools;

one pathway that suggests itself is to color-adjust an arbitrary scan in, say, gimp, then compare it to the scan pre-adjustment, in gnome-color-manager, although precisely how to manage that is unclear; possibly involving adding an arbitrary target / chart type, although how?

As my color laser printer won't print a chart looking remotely similar to the reference charts, I suppose the most straightforward would be that when I order picture prints, then I order one of a chart I've downloaded, hope the picture printing service manages to print it properly :-)

sounds a load of hassle for a 'simple' scanning application though