search

AOMediaCodec / libavif

libavif - Library for encoding and decoding .avif files
Other
1.53k stars 195 forks source link

It would be nice if avifenc supported adding a downscaled thumbnail #605

Open leo-barnes opened 3 years ago

leo-barnes commented 3 years ago

From the discussion in this av1-avif issue and the last SG-Image meeting, the conclusion was that the spec now has everything needed for doing progressive refinement either via a separate thumbnail image or via multi-layer coding.

It was concluded in the meeting that the next step would be for implementations and tooling to start using it. Adding a downscaled, very low quality thumbnail to images would be a good step as shown in @jakearchibald's experiments in the issue linked above. @skal65535 mentioned that avifenc currently does not support adding a thumbnail, or at least not to add an automatically downscaled thumb with low quality. Adding that functionality would be a good way for people to start generating content that can then be used to test decode implementations.

jakearchibald commented 3 years ago

Maybe a good first step would be to provide the APIs to take an existing AVIF image and make it the thumbnail of another (maybe those already exist). We could integrate that into Squoosh.app.

leo-barnes commented 3 years ago

Maybe a good first step would be to provide the APIs to take an existing AVIF image and make it the thumbnail of another (maybe those already exist).

I think GPAC/MP4Box might support doing that already. Not extremely familiar with it though. @tdaede probably knows.

dtruffaut commented 3 years ago

I'd like blurring to be automatically handled in pre-processing (inside image), or in post-processing (by browser). CSS blurring is bad for performance when images are displayed into an infinite virtual scroller, and the user scrolls fast.

toastal commented 3 years ago

With talks of blurring... can we make sure whatever blurring route is taken it's a linear gamma blur and not an sRGB blur (i.e. CSS's filter: blur(16px)) like some of the demos in the previous thread? The blobs of muddy dark colors look bad and aren't "correct".

jakearchibald commented 3 years ago

I only used CSS's blur because it was there. A real implementation needs to be a lot faster, and as you say, linear.

anonwins commented 2 years ago

So what happened to this?