[Cin] Clipping to 1.0 investigation.

[Andrew Randrianasulu]

so, very strange! I am testing patch from BT294 and apparently even if
with rgba-float and opengl output colorpicker volumes still slipped to
1.0 it provides much better darkened image with recovered highlights!

just with fader at 9 ...

LIBGL_DRI3_DISABLE=1 vblank_mode=0 bin/cin

I tried attached very simple xml with Andrea's test file
AND my two other patches

applying or reverting opengl3 patch seems to give much more
resurrected image in ogl preview ...

On Wed, Nov 8, 2023 at 8:55 PM Andrew Randrianasulu
<randrianasulu at gmail.com> wrote:
>
> indeed, with this mod Histogram can recovery highlights ...
> but again, I have no idea if  it can work ok with this mode turned on
> all the time, so maybe make it preference or conditional on rgb(a)
> float?
>
> On Wed, Nov 8, 2023 at 8:41 PM Andrew Randrianasulu
> <randrianasulu at gmail.com> wrote:
> >
> > or even like this, but histogram does not work sadly?
> >
> > will try to remove clamps from its code too, Like Andrea
> >
> > On Wed, Nov 8, 2023 at 8:26 PM Andrew Randrianasulu
> > <randrianasulu at gmail.com> wrote:
> > >
> > > with this HACK buffers can be overbright in X11/XV mode only, gl thrown error!
> > >
> > >
> > > On Wed, Nov 8, 2023 at 6:55 PM Andrew Randrianasulu
> > > <randrianasulu at gmail.com> wrote:
> > > >
> > > > On Wed, Nov 8, 2023 at 6:08 PM Andrew Randrianasulu
> > > > <randrianasulu at gmail.com> wrote:
> > > > >
> > > > > I tried cingg compiled on Nov, 1 2020 and issues still here - you need native exr reader to see it with Andrea's sample. Either by compositor's vectoroscope or color picker - in clipping case it will show 1.0 for much of window area, in non-clipping mode (no plugins) it will show up to 60.something in rgb channels!
> > > > >
> > > > > Sadly, 2018 version had no vectoroscope on compositor, need to double-test if native exr reader + any plugin will fail there in the same way via color picker.....
> > > >
> > > > so, may 6 2018 cingg exhibit same behavior on rgba-float tiff exported
> > > > from cin-cv (because pure exr import somewhat not worked for me in
> > > > this  version).
> > > >
> > > > so, this is apparently not recent bug .....
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