Resizing an image

[Anon]

My main goal is to crunch all the images in a given directory. I'd also like to add a header/footer to each image, but that's a different story.

The first problem is I'm getting an error: call to an undefined function (ImageCreate), even after I put in my header.

<?php
// resize
Header("Content-type: image/jpeg");

$original = "big.jpg";
$small = ImageCreate(100,100);
ImageCopyResized($small,$original,0,0,0,0,100,100,500,500);
Imagejpeg($small, "new_big.jpg");

ImageDestroy($original);

?>

So from what I gather we need to
1. Create a canvas (using ImageCreate())
2. Draw a picture on the canvas
3. Send the picture to the browser or save
4. Clean up memory

Is there some enviroment variable I'm missing that it's not recognizing ImageCreate or am I possibly missing a whole library?

Thanks

[Anon]

I really need to crunch the image on upload, which is written in perl, but I have no clue which function to use in Perl to crunch an image.

For you Perl/CGI guys..do you know the answer?

Right now I'm forced to write it in PHP, then execute my PHP script from Perl...Sounds like fun!!

By the way..I's pick PHP over Perl anyday, but there's not too many Perl talk forums out there that could answer that question

[thepriest]

You're in need of the GD library to do any graphics output in PHP.

It may, or may not, be useful looking into the convert
command (on *nix machines).
Call it from perl, php, wherever.
It resizes images, does alot of funky stuff.

hope this helps,
=)