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


On Mon, Nov 10, 2014 at 5:30 PM, Pat David <patdavid gmail com> wrote:
I can't add much to the color discussion, but at least I can offer up just
about any of my images as RAW for any testing (just about everything I
shoot is cc-by-sa usually).  If anyone finds one of mine they would like,
just let me know and I'd be happy to provide the camera raw file.

I was actually gonna suggest to perhaps ask you, in particular for the
"nice set of pictures of people's faces, young to old, male and
female, of diverse skin colors." since I know you like to shoot
people. That may be a start.
Since you forgot to add a link to your photos (maybe out of
humility?), here they are:

Unfortunately I am about the same for the actual color discussion
part, and I'm not sure which photos are the best for
color/printer/algorithms/other tests, but I can for instance host the
test suite photos. Maybe under or some
similar URL. So I suggest that if someone on this thread thinks that
this or that photo is interesting, tell me, and I'll make a test page
gathering raw photos. With time, I think we should be able to gather a
good suite of standard copyleft test photos.


On Fri, Nov 7, 2014 at 1:24 PM, Elle Stone <ellestone ninedegreesbelow com>

On 11/07/2014 10:25 AM, Jehan Pagès wrote:

A good test suite of "copyleft" images would be a nice thing to have,
whether for testing new and existing editing algorithms, or for whatever
testing that individual GIMP users might want to do on their own
(printer-related, for example).

That's a good idea. What kind of images would be the most interesting?
Basically should that be images, taken with a good digital camera, of
a lot of objects of various colors?
It could also be images with color gradients, I guess (sunset/rise and
Or do you already have such copyleft images at your disposal that you
could provide?
Indeed if we could gather these for access to anyone as reference
(then various software could use them for their own tests), it would
be great.


Nicolas Robidous's test image collection is very nice, in particular the
baby's face and the brightly colored buildings make great test images. His
images are already converted to sRGB, which means they can't really fully
exercise the color gamuts of reasonably decent printers and wider gamut

I can make available "straight from the camera interpolated raw file, no
enhancements added" images of very saturated (outside the sRGB color gamut)
natural objects, mostly flowers.

I've also put together various artificial color ramps, granger rainbows,
stepped gray scales, and such. And I have IT8 target shots from several
cameras, which I think the photographers would release under an appropriate

I wish that I had a nice set of pictures of people's faces, young to old,
male and female, of diverse skin colors. Skin tones are something that
everyone wants to get "just right", so faces make great test images. Such
photographs ideally would be shot raw under natural daylight, more or less
full frame, and properly white balanced, preferably with a white balancing
object discretely placed somewhere in the image frame (styrofoam cups, PVC
plastic, white coffee filters all work really well, often as well as
commercially available white balancing aids).

High quality images with good gradients would be a nice addition to a
collection of test images. Interpolated raw files that have been output in
a wider gamut color space would be more versatile than images that have
already been converted to sRGB.

Here are links to some sample collections of copyrighted test images:

I would love to have enough copyleft images to put together a copyleft
composite similar to the one in the above link.

Thinking more about "what kind of images", it depends on who's testing
what. Here are some possible reasons for wanting test images:

* Testing scaling algorithms.

* Testing ICC profile conversions from wider gamut color spaces to printer
profiles and/or to display screen profiles.

* Testing the quality of prints made by a commercial or personally owned

So the first question is: What kind of test images, for what kinds of
testing, do you all, as a diverse group of GIMP users and developers, wish
you had access to?


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