[Image-SIG] General question on JPEG file format
Fri, 7 Jul 2000 21:39:32 +0200
> This isn't really a Python or PIL question, but I thought
> the people reading this particular list were likely to know
> the answer :-)
looks like we're all too busy...
> My understanding is that JPEG is really just a compression
> algorithm, and that what most people think of as JPEG files
> are actually JFIF files. From perusing the specs for a JFIF
> file, it also seems that JFIF makes provision for the inclusion
> of thumbnails and other metadata about the main image.
> However, I've never actually seen this used by picture
> viewers, creators, etc. /.../ Are there reasons this isn't
> commonly done with JPEG/JFIF files?
I think you just answered your own question ;-)
Very few applications support this, which is why very few
application writers bother to implement it... (this also in-
cludes library writers like yours truly -- I cannot remember
seeing any widely used application that supports this, and
nobody has ever asked for JFIF metadata support for PIL...)