Re: [Gimp-developer] [Gimp-user] Test images and test suite (was Re: GIMP should fork babl and GEGL)

On 11/13/2014 10:02 AM, Simon Budig wrote:

I do have access to a x-rite color checker which should be in a
reasonably good condition (it is slightly older but has been stored in
the dark).

I could try to set up a colorful scene and shoot it in RAW with my
Nikon D40. Would this be of any help?

Yes. A colorchecker is very often found in composite test images. Given the number of websites that post pictures of colorchecker charts, hopefully there are no copyright restrictions on photographs of same.

(I am right now unsure about the correct lighting, there *should* be
some daylight neon tubes around, but I am at the moment unsure where
they are...)

You raise a good point. On the one hand, natural daylight on a sunny day (D65ish) and direct morning and late afternoon/early evening sunlight (D50ish) are wonderful full spectrum light sources that really bring out colors. On the other hand, studio lighting is either iffy or expensive and probably sometimes both (my own studio lighting is on the "cheap and iffy" side).

Where I am sunlight is in short supply until spring, so it's studio lighting or nothing. For flourescent and LED lighting, the fact that the label says "daylight" is not very informative by itself. The other half of the story is the CRI, "color rendering index" ( Anything 92 and above is probably good enough.


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