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

[Jehan Pagès <jehan marmottard gmail com>]

Hi,

On Fri, Nov 7, 2014 at 1:07 PM, Elle Stone
<ellestone ninedegreesbelow com> wrote:
> On 11/06/2014 11:24 AM, Gary Aitken wrote:
> > Even if the result is not obvious visually, I need a heads-up
> > so I can pay close attention to what's happening and undo the
> > operation if appropriate.
>
>
> On 11/07/2014 04:25 AM, Simos Xenitellis wrote:
> > Is there a test suite available that could show the expected behavior?
> > If not, let's try to build one, both the test-suite code plus the images
> > (before/after).
>
>
> As Gary hinted, when doing "X" to an image, whatever "X" might be, sometimes
> results are visually obvious and sometimes not. Many times when editing
> images, I've done "X" and thought "X" was just fine, only to realize later
> that "X" had changed the file in an unwanted way that only became obvious
> several editing steps later.
>
> And sometimes "X" can make a change in an image that the monitor's limited
> color gamut can't display, that might only pop up visually when the image is
> printed or displayed on a wider gamut display.
>
> There are a lot of nice copyright-encumbered test images available on the
> internet, but not many "copyleft" test images, and not many images that
> reflect the full range of colors as captured by digital cameras and then
> interpreted using typical matrix input profiles.
>
> When I was testing unbounded sRGB image editing, the first task was to put
> together some appropriate test images and then figure out which tests needed
> to be made, as per Simos's "test suite".
>
> 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

> Best regards,
> Elle Stone
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