[REBOL] JFIF -> EXIFutils
From: jason::cunliffe::verizon::net at: 27-Oct-2002 2:28
well I tried out some gui ones, then found a very nice command line tool suite
for EXIF metadata. "EXIFutils" is postcardware/shareware for
Windows95/98/ME/XP/2000, Redhat Linux 7.2, MacOS X, and Solaris 8.
Works fine with Command :-)
But it would be great to have a version written 100% in Rebol.
As digital cameras become ubiquitous, so will EXIF metadata.
The nice thing is one can and edit EXIF data in any JPEG or TIFF images.
EXIF lets images store thumbnails of themselves and other cool things.
I had worked on PNG metadata some time ago, including for storing REBOL scripts.
I thought that JPEG metadata could only be very short. It now seems EXIF may
also be capable of variable length text metadata.
EXIFutils will can only extend to storing special metadata strings up to 999
characters, but the docs say that the EXIF spec allows unlimited text string
description. If so then any Rebol scripts can be stored too. I need to confirm
I know Oldes wrote a PNG script.
[I've had a few problems with it- does not match the results I get with other
PNG metadata tools]. This kind of lower level binary file handling is a bit
beyond my current skills, but I 'd love to learn. Any advice about how to
implement EXIF in rebol would be welcome.