[XForms] JPEG/EXIF support?

Michal Szymanski msz at astrouw.edu.pl
Mon Nov 24 13:07:06 EST 2003

On Mon, Nov 24, 2003 at 05:41:04PM +0100, Jean-Marc Lasgouttes wrote:
> >>>>> "Michal" == Michal Szymanski <msz at astrouw.edu.pl> writes:
> Michal> To subscribers of the xforms list Hi,
> Michal> It seems that JPEG support in XForms 1.0 is only for
> Michal> "standard", JFIF format. I have plenty of JPEG/EXIF "extended"
> Michal> format images from digital camera which I'd like very much to
> Michal> display using XForms. Now, unfortunately, I'm getting messages
> Michal> like:
> Michal> In OpenImage [image.c 224] Guad22.jpg: Unknown image format
> Where is this JPEG/EXIF thing described?

A quick search on the net resulted in following:

EXIF stands for Exchangeable Image File Format, and is a standard for
storing interchange information in image files, especially those using
JPEG compression. Most digital cameras now use the EXIF format. The
format is part of the DCF standard created by JEIDA to encourage
interoperability between imaging devices.

>From what I could quickly find, EXIF data in a JPEG file is stored in an
application segment APP1. It seems that JPEG standard supports such
segments - I'm not sure why the JPEG code in XForms can't deal with such
images (if they really conform to JPEG standard, as it seems).


http://www.exif.org/  and links therein, of which one is particularly good:

regards, Michal.

  Michal Szymanski (msz at astrouw.edu.pl)
  Warsaw University Observatory, Warszawa, POLAND

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