JPEG comment data
Rodney Tamblyn
rodneytamblyn at paradise.net.nz
Tue Sep 23 21:15:00 EDT 2003
Hi Dar,
Thanks for the response.
For those who are interested, here's some links I've found to the Exif
specification, the first one is especially good.
http://www.ba.wakwak.com/~tsuruzoh/Computer/Digicams/exif-e.html
http://www.exif.org/specifications.html
http://nwalsh.com/java/jpegrdf/
http://www.runrev.com/revolution/developers/bugdatabase/
show_bug.cgi?id=693
~ Rodney
On Wednesday, September 24, 2003, at 04:55 AM, Dar Scott wrote:
>
> On Monday, September 22, 2003, at 05:34 AM, Rodney Tamblyn wrote:
>
>> Does anyone have an example code snippet of how to access COM
>> (comment) or APP1 chunk information from JPEG images in Revolution?
>
> I have not broken up JPEG, but I have attacked other binary files in
> Revolution.
>
> The file format seems to be defined for additional info, though there
> might be some idiosyncrasies. Process the file using binaryDecode.
> One approach would be to make a function that takes an image and
> returns, say, an array of values by name. The name might be based on
> that used in standards. For fixed position fields, access functions
> might work, but I have found that accessing data with variable length
> fields is easier if the file is preprocessed to break out the
> components. The only problem is that arrays can currently be only one
> layer deep and line and item lists are needed for the other levels.
> In most cases that is just fine. In other cases, data can be burst in
> layers.
>
> Dar Scott
>
> ****************************************
> Dar Scott Consulting
> http://www.swcp.com/dsc/
> Programming Services
> ****************************************
>
> _______________________________________________
> use-revolution mailing list
> use-revolution at lists.runrev.com
> http://lists.runrev.com/mailman/listinfo/use-revolution
>
>
--
Rodney Tamblyn
44 Melville Street
Dunedin
New Zealand
+64 3 4778606
http://rodney.weblogs.com/
More information about the use-livecode
mailing list