Overview of JPEG XT (2016)

by Sami_Lehtinen • 6 years ago

51 23 6 years ago

Hackbraten• 6 years ago

You may want to append (2015) to that title.

mkl• 6 years ago

XT, XR, XL, XS. I wish the names were more meaningful. I can never remember which one is which or what they're good for, or even which order they came in (and the jpeg.org pages don't even list years).

JPEG XL is the one currently in development, and it has what sound like some really neat features, like floating point pixel data, and lossless conversion from JPEG (and according to Wikipedia [1] back to JPEG, but I'm guessing that only applies to images that went JPEG -> JPEG XL -> JPEG).

[1] https://en.wikipedia.org/wiki/Joint_Photographic_Experts_Gro...

slovenlyrobot• 6 years ago

You can think of them all as JPEG NB.. 'no browser support' ;)

jacobush• 6 years ago

Still, "backwards compatible extensions to the legacy JPEG standard". So there's that.

Dylan168072• 6 years ago

That's what polyfills are for.

bryanlarsen• 6 years ago

Being backwards compatible is JPEG XT's tentpole feature.

tambourine_man2• 6 years ago

The browser scene is very different these days. Browsers are evergreen or yearly updated.

So are creation tools such as Adobe’s.

acqq• 6 years ago

The answer for JPEG XT is in Wikipedia:

https://en.wikipedia.org/wiki/JPEG_XT

"JPEG XT extensions are backward compatible with base JPEG/JFIF file format - existing software is forward compatible and can read the JPEG XT binary stream, though it would only decode the base 8-bit lossy image."

It is a standardization of how to put additional data in the already existing JPEG file format, the one that we already have supported everywhere.

Then, if some software "understands" what the XT parts of these JPEG files mean, it can use these new parts, still, the files are usable on every device, just these XT parts don't mean anything to the devices that don't understand XT.

m1sta_• 6 years ago

The additional data can be used, for example, but neural nets pretrained to cleanup particular images. Similarly, the data could have vectorisation data for key features.

jorvi• 6 years ago

The only ones I can ever remember are jpeg and jpeg2000. To be honest most tech has horrible naming schemes. The iPhones were a breath of fresh air for a while (iPhone 3G/S, iPhone 4/S, iPhone 5/S, iPhone 6S/Plus) up until the 7.

dkdbejwi383• 6 years ago

Jpeg XS Max

jl6• 6 years ago

Patent encumbered?

unlord2• 6 years ago

Yes, there is at least one third party patent license administrator for JPEG-XT:

https://www.sisvel.com/licensing-programs/digital-video-disp...

AlanYx• 6 years ago

The JPEG committee didn't believe it was patent encumbered, but Sisvel came along and put together a portfolio of patents it claims must be licensed to use JPEG XT. However, Sisvel at present is only claiming that devices with cameras have to license the patents.

Sisvel did the same thing with VP9 and a couple of other recent video codecs.

Overview of JPEG XT (2016)

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