Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 336 by
pdk...@gmail.com: regression in webp lossless (palette)
https://bugs.chromium.org/p/webp/issues/detail?id=336http://cdn.pwmon.org/1900/217b.x1.pngThe file has increased about 10% in size recently. It's caused by this. (Later commits don't matter.)
https://chromium.googlesource.com/webm/libwebp/+/75a9c3c45230d995af10daf5ceeff5ddda1f8543# new
$ cwebp 217b.x1.png -lossless -o 217b.x1.png.webp
Saving file '217b.x1.png.webp'
File: 217b.x1.png
Dimension: 681 x 54
Output: 8270 bytes
Lossless-ARGB compressed size: 8270 bytes
* Header size: 51 bytes, image data size: 8194
* Precision Bits: histogram=5 transform=5 cache=0
* Palette size: 29
# old
$ cwebp 217b.x1.png -lossless -o 217b.x1.png.webp
Saving file '217b.x1.png.webp'
File: 217b.x1.png
Dimension: 681 x 54
Output: 7446 bytes
Lossless-ARGB compressed size: 7446 bytes
* Header size: 56 bytes, image data size: 7364
* Lossless features used: PALETTE
* Precision Bits: histogram=5 transform=5 cache=0
* Palette size: 29
Less at 2x resolution.
http://cdn.pwmon.org/1900/217b.x2.png# new
$ cwebp 217b.x2.png -lossless -o 217b.x2.png.webp
Saving file '217b.x2.png.webp'
File: 217b.x2.png
Dimension: 1362 x 108
Output: 17056 bytes
Lossless-ARGB compressed size: 17056 bytes
* Header size: 57 bytes, image data size: 16974
* Precision Bits: histogram=5 transform=5 cache=0
* Palette size: 24
# old
$ cwebp 217b.x2.png -lossless -o 217b.x2.png.webp
Saving file '217b.x2.png.webp'
File: 217b.x2.png
Dimension: 1362 x 108
Output: 15950 bytes
Lossless-ARGB compressed size: 15950 bytes
* Header size: 57 bytes, image data size: 15867
* Lossless features used: PALETTE
* Precision Bits: histogram=5 transform=5 cache=0
* Palette size: 24
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