Changed requirements for images in OPDS 2.0

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Contains all the current drafts for the OPDS specifications

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Changed requirements for images in OPDS 2.0 #80

Closed HadrienGardeur closed 2 months ago

HadrienGardeur commented 2 months ago

Based on @llemeurfr initial comment on #52 :

Lowered the requirement for images in publication to a SHOULD
Dropped requirement from the JSON Schema
Added AVIF support in spec and JSON Schema

HadrienGardeur commented 2 months ago

While the initial issue opened by @llemeurfr didn't mention AVIF, I used this opportunity to add it to the list of supported formats.

AVIF is now widely supported across browsers and it's a strong contender for replacing JPEG as the default format for covers in OPDS now. WebP is another potential addition to this list, but I'm not sure that it makes a whole lot of sense now that AVIF is well supported.

barmintor commented 1 month ago

For what it is worth: I think the spec would benefit from being silent about required image formats for thumbnails:

The ability to display an image of a given format is an out-of-band client concern
The images property/collection is not required for correctness
The spec includes MIME information for the links for a client to decide whether it can make use of the link
There's no difference for the reader between there not being a supported image and there not being images at all