[Cin] Clipping to 1.0 investigation.

[Andrew Randrianasulu]

https://youtu.be/7GOhtJciHBk

in theory should contain my video showing patched cingg

On Thu, Nov 9, 2023 at 12:17 AM Andrew Randrianasulu
<randrianasulu at gmail.com> wrote:
>
> or may be even this xml with smooth fading curve ...
>
> On Thu, Nov 9, 2023 at 12:11 AM Andrew Randrianasulu
> <randrianasulu at gmail.com> wrote:
> >
> > 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 .....