View Single Post
Old 15th May 2015, 07:45   #30013  |  Link
Dogway
Registered User
 
Join Date: Nov 2009
Posts: 2,352
Quote:
Originally Posted by Asmodian View Post
edit: BTW, the screen shots from that post were not using "chroma upscale", the source was RGB so "chroma upscale" was never needed or possible. The point was to test luma only doubling (with Jinc3 or Catmull-Rom for chroma scaling) v.s. both luma and chroma doubling.
As I said, it behaves exactly as it currently does and as madshi stated, luma and chroma doubling don't use the same upscaler. This produces aliasing mismatches like the ones seen in the picture.

Quote:
Originally Posted by Asmodian View Post
A lowpass filter?! A 16-bit RGB->YCbCr->RGB does not behave like a lowpass filter. It isn't going to YCbCr 4:2:0.
Don't raise any eyebrows, every conversion behaves like a lowpass filter when done successively, even with full chroma. This is original chroma plane, this is chroma plane after YUV,RGB,YUV444,RGB,YUV. And yes, it even has a lowpass filter feel to it when I use YUV444 for the last conversion. Test script.

Last edited by Dogway; 15th May 2015 at 08:23.
Dogway is offline   Reply With Quote