Closed GoogleCodeExporter closed 8 years ago
Sorry i mean this encoder version: WebPGetEncoderVersion() -> 0x00000103
Original comment by remo.eic...@gmail.com
on 18 Jan 2013 at 12:19
Alpha support in 0.1.3 was highly experimental (and less efficient than the
final version).
Best is really to recompile a dwebp from 0.1.3 and re-convert the files to the
new definitive format.
Original comment by pascal.m...@gmail.com
on 18 Jan 2013 at 3:05
But then i need to convert with old code from webp to png and then with a new
version from png to webp? Or is there a better variant?
Original comment by remo.eic...@gmail.com
on 18 Jan 2013 at 3:10
assuming you have dwebp built from 0.1.3 and cwebp built from latest version
0.2.1, you could do:
dwebp_0.1.3 old_file.webp -o foo.png && cwebp_0.2.1 foo.png -o new_file.webp
${opts}
where $opts is the options you once used to compressed the old_file.webp (-q 80
etc...)
This is a re-encoding of an already compressed file, but it should be fairly
harmless regarding degradation, if you use the same encoding options $opts.
Original comment by pascal.m...@gmail.com
on 18 Jan 2013 at 10:39
Thanks, but the new 0.2.x reads the old format 0.1.x without alpha support. Is
it possible to extract the alpha channel from the 0.1.x format and merge the
0.1.x RGB picture (without any recompression) to a new 0.2.x webp image?
I didn't find any working version information of a 0.1.x webp binary data to
recognize an old version of webp image file. Is this correct?
Original comment by remo.eic...@gmail.com
on 21 Feb 2013 at 8:25
Seems like a too old problem.
If this is still an issue, please re-open.
Original comment by pascal.m...@gmail.com
on 19 Aug 2014 at 12:51
Original issue reported on code.google.com by
remo.eic...@gmail.com
on 18 Jan 2013 at 10:18