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64 bits png lost his alpha when converted with cwebp #268

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
cwebp.exe -q 80 -alpha_q 100 -m 6

64 bit png in attached file.

Original issue reported on code.google.com by bruno.de...@gmail.com on 8 Oct 2015 at 10:28

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GoogleCodeExporter commented 8 years ago 
Output

Original comment by bruno.de...@gmail.com on 8 Oct 2015 at 10:29

Attachments:

GoogleCodeExporter commented 8 years ago 
Thanks for the report. The alpha detection in the WIC-based decoding on windows 
is fragile as demonstrated here. This change [1] will address the current 
issue, but it may appear with other input formats. Note webp only supports 
32-bit rgb with alpha so a conversion will be done in this case.

[1] https://chromium-review.googlesource.com/#/c/304872/

Original comment by jz...@google.com on 9 Oct 2015 at 3:37