Martin Geisler wrote:
> dave <[EMAIL PROTECTED]> writes:
>
>
>> dave wrote:
>>
>>> hello
>>>
>>> i'm working on a photo gallery for my site which uses gd to resize
>>> pictures, this strips the exif metadata from the image file
>>>
>>> my plan was to grab the exif data first (this was ok), then add it
>>> back to the resized image (this was not ok)
>>>
>>> [...]
>>>
>>
>> oops, can't believe i didn't see this earlier
>> just get the exif data of the old file, load a new peljpeg with the
>> new file and use insertSection to add the APP1 section to the new
>> jpeg
>>
>> easy :D
>>
>
> Well, it is meant to be easy :-)
>
> Please, if you get a piece of working code for this, then I would love
> to include it as an example in the PEL distribution. Both as a
> commandline and as a webserver script. I'm sure a lot of people would
> appreciate it!
>
> Also, you might want to take a look at the code in SVN if you haven't
> already. I've recently added a getExif() and a setExif() method to
> PelJpeg. The setExif() method is the non-trivial one: it will insert
> the PelExif object at the correct position amoung the other sections.
>
> http://tinyurl.com/ve6nu
>
>
well, it's a part of a larger base of code that i am working on, but
basically, this is all i did
// create the new PelJpeg object
// load the local path of the jpeg to the object, this all happens after
the file has been uploaded and moved to a permanent location
$origJpeg = new PelJpeg();
$origJpeg->loadFile($fullFilePath);
// get the APP1 marker out, which will prolly contain the exif data
$exif = $origJpeg->getSection(PelJpegMarker::APP1);
// now process the image, $imageResource is a php image resource, the
image has been manipulated, eg. resized, watermarked, etc.
imagejpeg($imageResource, $fullFilePath, $maxQuality);
// if the original file contains exif data, we want to add that data to
the newly modified image
if (!is_null($exif)) {
// the newly created image will probably have the exif data stripped by
gd, so we add the exif taken from the original file into the new image
$newJpeg = new PelJpeg();
$newJpeg->loadFile($fullFilePath);
$newJpeg->insertSection(PelJpegMarker::APP1, $exif, 1);
// and then save the file again
file_put_contents($fullFilePath, $newJpeg->getBytes());
}
i think the getExif and setExif methods should make that code even
simpler, i only grabbed some updated code for PelEntryAscii from SVN,
but i'll have a look for some more stuff now
haven't really looked at modifying the exif data fields yet, but i'll be
having a play with that later as well
dave
>
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