Hi Chris, On 29 March 2011 16:28, Chris Moller <mol...@mollerware.com> wrote: > (The utterly prosaic background of this question is that my wife runs an > eBay business for which I am the reluctant photographer. Frequently, I > take multiple pictures of the same object, under the same lighting, > differing sometimes only in the distance of the object from the light. > The resultant colours in the photographs are frequently significantly > different and I use GIMP to try to make them match. This is remarkably > difficult to do and if I ever get the time I may undertake to write > something for GIMP to make this easier.) (And I won't even comment on > the near-impossibility of getting the image colours to perceptually > match the in situ colours...)
I've actually done some work on this. My package (only tangentially related to gimp) includes a colour calibration button, there's a description of the process on the website: http://www.vips.ecs.soton.ac.uk/index.php?title=Colour_calibration_with_nip2 The idea is that you take a photo including a colour standard (I use the Macbeth). Then select the chart in the photo and click "calibrate" to have it calculate a transform from your camera colour to sRGB. You can then use that transform to colour-correct other images. Macbeth have a "mini macbeth" now that has the same colour patches, but is a much more reasonable size. John _______________________________________________ Gimp-developer mailing list Gimp-developer@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
