Improve decoder chroma upsampling

GoogleCodeExporter commented 9 years ago

MaxST compares:
http://img408.imageshack.us/img408/6503/santaorig.png
http://img405.imageshack.us/img405/6784/santawebp90.png

What is the expected output? What do you see instead?
says Monty Montgomery:
The Webp decoder is using chroma pixel doubling for expansion
(which is wrong) instead of proper resampling, which makes it even
worse.

Please use labels and text to provide additional information.

skal says:
the decoder chroma upsampling could be made better, pretty much like the 
-fancy_upscaling mode in jpeg6b

Original issue reported on code.google.com by rab...@google.com on 8 Oct 2010 at 5:11

GoogleCodeExporter commented 9 years ago

fixed, per https://review.webmproject.org/#change,1089

Original comment by s...@google.com on 3 Nov 2010 at 11:38

Changed state: Fixed

GoogleCodeExporter commented 9 years ago

now in Chromium too:
http://codereview.chromium.org/4425002

Original comment by s...@google.com on 4 Nov 2010 at 2:16

teasame / webp

Improve decoder chroma upsampling #14