Comments (1)
kornelski
commented on August 16, 2024
Lossy to lossy conversion is a bad idea. I don't want to encourage that. In the conversion you will be losing more quality than you're saving in file size.
WebP lossy only supports half-resolution color channels. This is a very old technique that AV1 has obsoleted, so I've deliberately haven't supported it in this tool. Even WebP saved with very high quality setting will have color smudged, and storing that distortion in AVIF is a waste of bits.
AVIF's native chroma subsampling is not even fit for this, because it does not have defined upsampling, but WebP does.
OTOH WebP lossless is good and may even be better than AV1's lossless.
So I suggest if you already have WebP, leave it.
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Related Issues (20)
- Converted images sometimes get orange/magenta overlays on the right edge HOT 2
- Illegal instruction / trap invalid opcode HOT 6
- I'm not sure this compression is correct? HOT 2
- Add a flag to save the original creation date of the image HOT 1
- Update help message re. quality HOT 2
- 10-bit encoding is not available HOT 2
- 'error: too many pixels, not supported' on large files, again HOT 5
- Invalid starting bytes of the final image HOT 1
- No way to do 8 bit encoding any more ? HOT 3
- Weird pink stripe to the right side of AVIF generated from PNG HOT 3
- SIGILL when trying to use `-s 0` or `-Q 0` HOT 3
- cavif 1.5.2 images are no longer valid according to windows HOT 5
- cannot compile on debian 32bit HOT 1
- EXIF meta data HOT 2
- New Release HOT 1
- Building with Rust Nightly hangs forever HOT 1
- Cavif on Alpine linux HOT 2
- Detected as Malware HOT 3
- `cargo install cavif` fails due to inline `const` in `bitstream` crate HOT 2
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