[PD] [Gem] 10-bit per channel in Gem

[Roman Haefeli]

On Sam, 2017-04-29 at 15:30 +0200, Antoine Villeret wrote:
> afaik, Gem only supports 8bit per pixel images
> so all pix_* objects have this limitation
> I was wondering the same when working on image capture plugin with 10
> or 12bit camera
> I didn't find any solution to increase the depth without code
> refactoring

I think I found a work-round for my case, since I want to have more bit
depth with only one channel (greyscale). I swapped the header of a
24bit greyscale TIFF with the header of an RGB/8bit TIFF and thus was
able to get more resolution. However, this doesn't work with the
[pix_equal] -> [pix_mask] setup anymore and it seems its too slow
anyway. I'm now trying to do the masking with a  shader instead and
hopefully be able to use the extra bit depth with the trick mentioned
above (I'm still quite a GLSL noob, though... this will probably take
some time).

Roman



> 2017-04-28 23:52 GMT+02:00 Roman Haefeli <reduzent at gmail.com>:
> > Hey all
> > 
> > I'm looking for a method similar to what  [pix_equal] does but
> > supports
> > more than 8 bit per channel. With [pix_image] - [pix_equal], it
> > seems I
> > get only 256 steps with a greyscale image, even if the mask loaded
> > with
> > [pix_image] has 16 bit. Is this a limitation by openGL or by
> > [pix_image]? Would I have more luck when doing it with shaders
> > instead
> > of [pix_*] objects?
> > 
> > Thanks
> > Roman
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