Hi,

On Mon, Nov 10, 2014 at 5:30 PM, Pat David <patda...@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: https://www.flickr.com/photos/patdavid

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 testimages.libreart.info 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.

Jehan

> On Fri, Nov 7, 2014 at 1:24 PM, Elle Stone <ellest...@ninedegreesbelow.com>
> 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
>>
>>
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>
>
>
> --
> pat david
> http://blog.patdavid.net
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