[Bug 787582] videotestsrc: -I and +Q regions are wrong

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787582

--- Comment #2 from Julien Isorce <julien.isorce at gmail.com> ---
(In reply to Tim-Philipp Müller from comment #1)
> Wim claims in bug #681308 that they're not supposed to look the same :)

Thx for pointing that :) That would make sense but in order to understand I
would like to hear how the values have been computed/selected for RGB
colorspace. For instance in gstvideotestsrc these values are:

I_RGB(0,0,128)
Q_RGB(0,128,255)

Just as an example if I change Q_RGB to (128,0,255) then the +Q region becomes
purple instead of blue
(https://bug681308.bugzilla-attachments.gnome.org/attachment.cgi?id=220519)
which would better match with the YUV image.

I tried to see how other libs do; In ffmpeg they also have a smptebars source
but it only produces YUV:
https://github.com/FFmpeg/FFmpeg/blob/master/libavfilter/vsrc_testsrc.c#L1293

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