Thumbnail creation while uploading

VincentRommelaars wrote:

> Hello,
>
> I'm using the Blob upload extension to upload images to my web-page.
> When I want to display a thumbnail of the photo, I force scale the uploaded
> image to, let's say a 100 pixel width.
> But when I want to display a whole gallery this way, the download procedure
> take a lot of time.
>
> Is there a way, that when I upload my image, an extension creates a thumbnail
> at the same time?
>
> I hope so.
>
> Thanks
>
> kind regards Vincent
>

First of all, it sounds like your not showing a smaller image
(thumbnail) but the large image in a small cell... to do the thumbnail
properly, you should have two images, one full size, and one that is
small,(the small images load fast especially if you can preload) when
the user clicks on the small image, link the large one to it..

use PHP and create a copy of the image you want to upload after you
select it via PHP code, then upload both images into their respective
folders... etc...
this is an example cut from the PHP5 manual:

************************************************** ***********
<?php
// The file
$filename = 'test.jpg';

// Set a maximum height and width
$width = 200;
$height = 200;

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

// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);

if ($width && ($width_orig < $height_orig)) {
$width = ($height / $height_orig) * $width_orig;
} else {
$height = ($width / $width_orig) * $height_orig;
}

// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height,
$width_orig, $height_orig);

// Output
imagejpeg($image_p, null, 100);
?>
************************************************** ***************