New version of guetzli

[Jyrki Alakuijala]

We have a new version of guetzli with two improvements: new more precise butteraugli and smarter handling of low frequency features. New butteraugli gives possibly a 2 % size improvement and an unspecified improvement in quality, but makes guetzli twice as slow and to use even more memory. The improvement in low frequency modeling possibly fixes guetzli to actually work well at lower qualities, at least down to 84. More experiences are needed of both before large-scale deployment...

https://github.com/google/guetzli

[nikkho]

Are there any updated binaries? Releases page is still at march 21th.

[Jyrki Alakuijala]

Are there any updated binaries? Releases page is still at march 21th.

Could you please report this at https://github.com/google/guetzli/issues ?

[nikkho]

Done as #236: https://github.com/google/guetzli/issues/236

[Jyrki Alakuijala]

Example improvement here at quality 84 -- I do recommend using higher quality but this improvement is most visible at low quality.

Old guetzli gives 181811 bytes:



New guetzli gives 175052 bytes:



These results are indicative, but as can be seen there is quite a big improvement on having less visible block boundaries in the sky at low quality settings.

[AiZ]

Hello,

win32 & win64 binaries, barely tested, be warned.
guetzli_20170906_win32_win64.7z

AiZ