(2020-07-24, 13:31)Orion Pobursky Wrote: I think MLCad is the only major outlier and it will probably never be updated. There are, however, quite few minority viewers/editors that will probably never be updated either. Most of those don't recognize the !COLOUR meta either so they can't rightly be said to follow the spec.
That said, there are several issue that Magnus brought up that can be objectively evaluated and maybe should be addressed in the spec (e.g. image dimensions). There are others that can only be evaluated subjectivity (e.g. image clarity) that should be hashed out in the review process.