There is something new to learn every day. I have never paid any attention to the “progressive” checkbox in the JPEG options dialog of GIMP. It turned out that this special (see description here) JPEG is a kind of better known to me interlaced GIFs. Interesting is that it’s only Internet Explorer who marks JPEGs, probably all JPEGs, not only those that are really progressive, as MIME type “image/pjpeg”. The card upload script was not ready to accept those but it’s fixed now. And I’m waiting for something like “regressive PNG” MIME type from the “market leader”.
