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. On Fri, Nov 7, 2014 at 1:24 PM, Elle Stone <ellestone@xxxxxxxxxxxxxxxxxxxx> wrote: > 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 >> such)? >> 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. >> >> Jehan >> >> > 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 > displays. > > 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 > license. > > 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: > > http://www.pcstats.com/articleimages/200601/samsungspp2040_300dpi1.jpg > > I would love to have enough copyleft images to put together a copyleft > composite similar to the one in the above link. > > http://www.northlight-images.co.uk/article_pages/test_images.html > > http://www.outbackphoto.com/printinginsights/pi048/essay.html > > > 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 > printers. > > 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? > > Elle > > > _______________________________________________ > gimp-developer-list mailing list > List address: gimp-developer-list@xxxxxxxxx > List membership: https://mail.gnome.org/mailman/listinfo/gimp- > developer-list > List archives: https://mail.gnome.org/archives/gimp-developer-list > -- pat david http://blog.patdavid.net _______________________________________________ gimp-developer-list mailing list List address: gimp-developer-list@xxxxxxxxx List membership: https://mail.gnome.org/mailman/listinfo/gimp-developer-list List archives: https://mail.gnome.org/archives/gimp-developer-list
