php GD Library file compression function

Bananna man

Hi,

Im using the GD library extension for the first time as i need to show thumbnail images from my database. Is their a GD Library function that will allow me to compress an image before it is output to the browser? I cant seem to find a function for this but im sure its possible?

Thanks

CoNfOuNd

I'm not completely sure but is this what you need..

http://www.weberdev.com/get_example-4594.html

Bananna man

Cheers, ill give that a lash. I'm surprised that their doesn't seem to be a GD Library function for this.

thekooman

hi,
i ain't a developer but i use "Bugzilla" to log bugs. some of the perl modules used compress images from bmp to gif and use GD libraries and also something called "image::magick".

i don't have an exact list but if you have a look through the bugzilla section in Google groups it might help.

forbairt

Jpegs ... are normally compressed images ? ... and you normally don't output bmps to browsers ...

Are you just looking for

bool imagejpeg ( resource $image [, string $filename [, int $quality]] )

Change the Quality to suit ?

Liam Byrne

forbairt wrote:

Jpegs ... are normally compressed images ? ... and you normally don't output bmps to browsers ...

Are you just looking for

bool imagejpeg ( resource $image [, string $filename [, int $quality]] )

Change the Quality to suit ?

That's what I was thinking....the link above is a file resizer/thumbnail generator......

The imagejpeg function will compress an image, but it'll affect the quality.

The only other "compression" I can think might be required is if the OP is delivering high-res images and wants to generate a TAR/ZIP file from them to make them smaller without losing quality ?

forbairt

I would have assumed the saving would have been minimal ...


maybe they are just after a resize ... ??

<?php
// File and new size
$filename = 'test.jpg';
$percent = 0.5;

// Content type
header('Content-type: image/jpeg');

// Get new sizes
list($width, $height) = getimagesize($filename);
$newwidth = $width * $percent;
$newheight = $height * $percent;

// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);

// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

// Output
imagejpeg($thumb);
?>