"Sam Najafi" <[EMAIL PROTECTED]> writes:
Hi Sam (and the PEL devel list)
> I'm working on enabling users to add entries or customizable fields
> into an Exif file rather than modifying metadata that is associated
> with an existing field or predefined image property. I was wondering
> if the PEL library has functions to allow me to do just that, or if
> not could you please enlighten me as how I should get around this
> problem!
So you want to use non-standard fields instead of the standard ones?
Then simply assign a tag value greater than 0xF000 to them. PEL will
then accept them as custom tags.
So something like this (coding off the top of my head...) should work:
$entry = new PelEntryAscii(0xF123, 'This is my very own tag...');
$ifd->addEntry($entry);
This wont work:
$entry = new PelEntryAscii(PelTag::DATE_TIME,
'Hehe, a string in the length...');
$ifd->addEntry($entry);
it will fail when such an image is stored and later loaded since PEL
will recognize the PelTag::DATE_TIME and expect it to be a proper
date. But if you stick to large tag values, then you should be safe.
It's not something which I've tested, but I think it works... please
report your findings back to me and the PEL devel list.
> Unfortunately I'm not very much knowledgeable in terms of Exif
> format and image compressions in general. Therefore your kind and
> valuable comment is greatly appreciated.
>
> Kindest Regards,
> Sam
--
Martin Geisler --- <[EMAIL PROTECTED]> --- http://mgeisler.net
Read, write, create Exif data in PHP with PEL: http://pel.sf.net
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