Resizing img component

Anon

Hi,

I found a component in VB to resize images (not only changing width and hight attributes) so that small images are not 40Kb. Is there something similar in php ?

Anon

sure there is, GD must be compiled in though. I wrote something as such to generate thumnails, but it can be easily modified.

$src_img = imagecreatefromjpeg("/tmp/big.jpg");
$new_w = 300;
$new_h = imagesy($src_img) / ( imagesx($src_img) / $new_w );

$dst_img = imagecreate($new_w,$new_h);
imagecopyresized($dst_img,$src_img,0,0,0,0,$new_w,$new_h,imagesx($src_img),imagesy($src_img));

Header("Content-Type: image/jpeg");
imagejpeg($dst_img, '', 65);

loook for more info on

http://www.php.net/manual/ref.image.php

If you do not have access to php's code to compile in gd support (www.boutell.com/gd/) I have heard of people useing imagemagik apps in linux through the exec() command. In windows I havent a clue.

Chris Lee

Anon

I also had to do this before. I no longer have the code but will tell you how I did it:

You must have the GD library installed. I will use the JPEG functions here; you will need to change them to whatever kind of image you are working with.

<?
//Set the new width and height
$newWidth = 100;
$newHeight = 100;

//Get the old image
$origImage = ImageJpeg("my_image.jpg");
$oldWidth = ImageSX($origImage);
$oldHeight = ImageSY($origImage);

//make the new one
$newImage = ImageCreate($newWidth, $newHeight);

ImageCopyResized( $newImage, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $oldWidth, $oldHeight );

// Then save and/or output the image ie.
// Header("Content-type: image/jpeg");
// ImageJpeg($newImage, 100);

Good luck!

Jack