Image resize, thumbnails

[autumn]

I see at least one post per month on how to resize images on the fly, and I don't blame them; there are hardly any decent tutorials on how to quickly do this especially if you are running PHP on Windows.

So here it is. A quick and dirty way to resize and replace your jpegs. Just make sure you un-comment extension=php_gd.dll in your php.ini file and also make sure the path to your extensions is where php_gd.dll resides.

Ok here we go. This is a simple function. Just copy it in your file and then call the function whenever you need to resize an image (most probably on your file upload page).

// resize function
function resize_jpg($img,$w,$h){

$thumb = imagecreate ($w, $h);
$image = ImageCreateFromJpeg($img); 

$imagedata = getimagesize($img); 

imagecopyresized ($thumb, $image, 0, 0, 0, 0, $w, $h, $imagedata[0], $imagedata[1]);

imagejpeg($thumb, $img);

}
// end function




// call resize function
resize_jpg("somepic.jpg",100,100);

That's it! The file somepic.jpg is now 100x100.

Good Luck

A

[x3ro]

i personally way prefer ImageMagick to GD. check out the simplicity:

function resizeImage ($origFile, $newFile) {
   `convert -size 70x70 $origFile -resize 70x70 +profile "*" $thumbFile`;
}

this'll work on Windows too, so long as you have ImageMagick installed in a folder in the system path.

[autumn]

yep agreed, I use imagemagick myself, a lot faster and easier to use + the compression quality is far more superior to GD. But if you don't want to install imagemagick or can't, then GD is good enough.

A