skal cbdd3e6e53 add a -dither dithering option to the decoder ...

Even at high quality setting, the U/V quantizer step is limited
to 4 which can lead to banding on gradient.
This option allows to selectively apply some randomness to
potentially flattened-out U/V blocks and attenuate the banding.

This option is off by default in 'dwebp', but set to -dither 50
by default in 'vwebp'.

Note: depending on the number of blocks selectively dithered,
we can have up to a 10% slow-down in decoding speed it seems.

Change-Id: Icc2446007f33ddacb60b3a80a9e63f2d5ad162de

2013-11-27 00:57:51 -08:00

..

cwebp.c

fix some warnings from static analysis

2013-09-13 11:33:30 +02:00

dwebp.c

add a -dither dithering option to the decoder

2013-11-27 00:57:51 -08:00

example_util.c

update copyright text

2013-06-06 23:09:14 -07:00

example_util.h

update copyright text

2013-06-06 23:09:14 -07:00

gif2webp_util.c

gif2webp: Add a mixed compression mode

2013-11-17 18:04:07 -08:00

gif2webp_util.h

gif2webp: Add a mixed compression mode

2013-11-17 18:04:07 -08:00

gif2webp.c

gif2webp: Add a mixed compression mode

2013-11-17 18:04:07 -08:00

jpegdec.c

dwebp: use default dct_method

2013-09-03 15:48:41 -07:00

jpegdec.h

update copyright text

2013-06-06 23:09:14 -07:00

Makefile.am

gif2webp: Support a 'min' and 'max' key frame interval

2013-09-12 13:41:09 -07:00

metadata.c

update copyright text

2013-06-06 23:09:14 -07:00

metadata.h

update copyright text

2013-06-06 23:09:14 -07:00

pngdec.c

pngdec: output error messages from libpng

2013-07-09 17:33:21 -07:00

pngdec.h

update copyright text

2013-06-06 23:09:14 -07:00

stopwatch.h

fix some warnings from static analysis

2013-09-13 11:33:30 +02:00

test_ref.ppm

lot of cosmetics

2010-11-17 20:09:47 -08:00

test.webp

remove INAM, ICOP, ... chunks from the test webp file.

2012-07-19 17:34:04 -07:00

tiffdec.c

update copyright text

2013-06-06 23:09:14 -07:00

tiffdec.h

update copyright text

2013-06-06 23:09:14 -07:00

vwebp.c

add a -dither dithering option to the decoder

2013-11-27 00:57:51 -08:00

webpmux.c

webpmux: DisplayInfo(): remove unnecessary error checks.

2013-09-18 11:44:24 -07:00

wicdec.c

wicdec: silence a format warning

2013-06-14 18:44:59 -07:00

wicdec.h

update copyright text

2013-06-06 23:09:14 -07:00