På Sun, 22 Jan 2012 11:02:35 +0100, skrev Michal Fapso <michal.fa...@gmail.com>:
Thanks for your comments, Hermann. It seems to me that using only float RGBA color model would be quite a good solution. Plugins would become simpler and should behave coherently for any videos and precision should be also fine.
Indeed. However, Float RGBA is buggy, at least in my builds. I can import Float formats like OpenEXR, and do HDR colour correction on them in Cinelerra. But 8-bit images and videos come out black as soon as I apply any effect or adjustment. I have not figured out why yet.
The drawback I see here is that float would require 4-times morememory than "YUVA 8 bits per channel". Also computation would beprobably slower for floats.
And all this extra precision is applied to the same old coarse 8-bit gamma-encoded data, without any prior smoothing. Same with the half-resolution colour data, which _could_ have been processed as separate image "planes", halving the number of pixels per frame. Naïvely upscaled images introduce false information, like aliasing, banding, artificial noise. High-precision effects need pristine input to work well. Either untransformed pixel data, or very well filtered and precisely transformed data. The latter is expensive (slow!) -- Herman Robak _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
