2017-03-15 22:52 GMT+01:00 Mateusz Brzostek <mate...@msystem.waw.pl>: > Hello! > > There are 3 problems with DITHER_COPY macro in libswscale/swscale_unscaled.c: > 1) there is overflow in dithering from 12-bit to 10-bit (output value > 1023); > 2) for limit range the lower limit is not respected, for example from 10-bit > to 8-bit value 64 is converted to 15; > 3) for many iteration of downscale/upscale of the same image the 200th > iteration is significantly darker. > > The first bug is due to wrong dithers table (now it is OK only for 8-bit > destination), fix is: > - const uint8_t *dither= dithers[src_depth-9][i&7];\ > + const uint8_t *dither= dithers[src_depth-dst_depth-1][i&7];\
I believe this implies that you could split your patch. Carl Eugen _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
