Don't see any reason to have users specifying it, this stuff should be handled automatically. WONTFIX?

plugwash wrote:

Don't see any reason to have users specifying it,

The optimum (as in best compromise between quality and size) format for a thumbnail is heavilly dependent on the type of image.

this stuff should be handled automatically.

Do you have an algorithm that can make good descisions about what output format to use?

Either way the current situation of having no way to upload a lossless copy of a photo (to avoid generation loss) while producing lossy (to keep size down) thumbnails from it is pretty poor.

Note, this is possible for tiff images (lossy parameter)

The original request to give the editor the burden of choosing an appropriate format sounds like a potential WONTFIX - how many people would know the advantages of which image file format?
Finding an algorithm to make that decision sounds like a separate request...