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PNG has been updated for the first time in 22 years — new spec supports HDR and animation (www.tomshardware.com)
submitted 1 year ago by to c/technology@lemmy.world
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[–] 4 points 1 year ago (9 children)

It makes sense, right? Is there a way around that when adding new features to a file format?

The alternative is to make another file format for clarity, but it's not really what you want to do.

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  • [–] 8 points 1 year ago (8 children)

    That depends. Something like HDR should be able to fall back to non-HDR since it largely just adds data, so if the format specifies that extra information is ignored, there's a chance it works fine.

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  • [–] 1 point 1 year ago (4 children)

    I'm not sure you can turn an hdr image into a regular one just by snipping it down to 8 bits per channel and discarding the rest.

    I mean it would work but I'm not certain you'll get the best results.

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  • [–] 1 point 1 year ago (3 children)

    it would work

    And that's probably enough. I don't know enough about HDR to know if it would look anything like the artist imagined, but as long as it's close enough, it's fine if it's not optimal. Having things completely break is far less than ideal.

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  • [–] 1 point 1 year ago (2 children)

    You'd probably get some colours that end up being quite off target. But you'll get an image to display. So in the end it depends on how much "not optimal" you're ready to accept.

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  • [–] 1 point 1 year ago* (1 child)

    Right, and it depends on what "quite off target" means. Are we talking about greens becoming purples? Or dark greens becoming bright greens? If the image is still mostly recognizable, just with poor saturation or contrast or whatever, I think it's acceptable for older software.

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  • [–] 2 points 1 year ago

    So it depends on the specific HDR encoding used, Rec2020 is the most common ones you'll see (It's meant for "pure" setups, i.e. where the source and output are tightly linked, e.g. gaming consoles or blu-ray, or so) and the raw data won't look great. While something like HLG (Hybrid-Log Gamma) is designed for better fallback (As it's meant for TV broadcast, where the output device is "whatever TV the user has"), so should just look dimmer.

    This is a HDR screenshot I took of Destiny 2, which uses Rec2020, tone mapped to SDR

    And here's the raw screenshot data from before tonemapping.

    If the second image had all the right HDR metadata, and the viewer supported it properly, then both images would match.

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  • [–] 1 point 1 year ago (2 children)

    I see, but the animation feature cant be compatiable no?

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  • [–] 3 points 1 year ago (1 child)

    Likely, you'll see the first frame only on older software. Encoding animation in a dedicated animation chunk and using the base spec for the first keyframe sounds like the sane thing to do, so they likely did that.

    I'm not going to look into it now, because I would then have to implement it. :D

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