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

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leo-barnes opened this issue Apr 20, 2021 · 6 comments
Open

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

leo-barnes opened this issue Apr 20, 2021 · 6 comments

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@leo-barnes
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@leo-barnes leo-barnes commented Apr 20, 2021

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
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@jakearchibald jakearchibald commented Apr 20, 2021

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
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@leo-barnes leo-barnes commented Apr 21, 2021

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
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@dtruffaut dtruffaut commented May 5, 2021

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
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@toastal toastal commented Jun 18, 2021

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
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@jakearchibald jakearchibald commented Jun 18, 2021

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
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@anonwins anonwins commented Oct 7, 2021

So what happened to this?

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5 participants