Issue 268 in webp: 64 bits png lost his alpha when converted with cwebp

[we...@googlecode.com]

Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 268 by bruno.de...@gmail.com: 64 bits png lost his alpha when
converted with cwebp
https://code.google.com/p/webp/issues/detail?id=268

cwebp.exe -q 80 -alpha_q 100 -m 6

64 bit png in attached file.

Attachments:
meuble_vente_ex...@2x.png 28.6 KB

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[we...@googlecode.com]

Comment #1 on issue 268 by bruno.de...@gmail.com: 64 bits png lost his

alpha when converted with cwebp
https://code.google.com/p/webp/issues/detail?id=268

Output

Attachments:
meuble_vente_ex...@2x.webp 1.8 KB

[we...@googlecode.com]

Updates:
Status: Started

Comment #2 on issue 268 by jz...@google.com: 64 bits png lost his alpha

when converted with cwebp
https://code.google.com/p/webp/issues/detail?id=268

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/

[we...@googlecode.com]

Comment #3 on issue 268 by jz...@google.com: 64 bits png lost his alpha

when converted with cwebp
https://code.google.com/p/webp/issues/detail?id=268

This has been merged, thanks again for the report.

3fb600d Merge "wicdec: fix alpha detection w/64bpp BGRA/RGBA"