Jake ArchibaldFolks who want to see JPEG-XL supported in more browsers, what is it about the format that attracts you to its use on the web compared to currently supported formats?
Amelia Bellamy-Royds@jaffathecake An infrequently mentioned feature of JPEG-XL is that it can have multiple image layers with different compression. AKA, it is the perfect image format for text-over-photo memes.
Henri Sivonen@AmeliaBR @jaffathecake Does this have current authoring tool support?
(I use JPEG XL off the Web myself, so I’m not generally a JPEG XL skeptic, but I’m curious which things are in the category “I have seen this in action off the Web and want to have it on the Web” and which things are in the category “I have not witnessed this, yet, but I want it from a feature list”.)
@hsivonen That's a good question. I'd assume it would be a key feature of exporting from editing software like Photoshop which has an integral layer model, so that you could re-import & separate it back out into editable layers. But I can't find any details in their support docs (beyond the fact that JPEG XL export was fairly recently added at all) & I don't have the software to check! @jaffathecake
@AmeliaBR @jaffathecake I tested the latest non-beta Photoshop (26.11.0) just now. Of the various commands that write files, JPEG XL is available only under Save a Copy… (mentioning this in case someone else wants to try; it took me a moment to find it). There the Layers checkbox is disabled for JPEG XL when the picture to be saved has a text layer. (The checkbox is enabled for TIFF.) Saving to JPEG XL flattens the layers. Could change in the future, but this is what it’s like now.
@AmeliaBR @jaffathecake Or at least flattens the layers in the sense that reopening in Photoshop itself does not show layers.