How Do I reduce an image automatically?

With PHP

[romzinho2k7]

Hey

I did a script that generates a thumb of the normal image( is not well a thumb, why the image is great ), but the matter is that I catch the image size, I multiply by 70 and divide for 100 to generate an image a little smaller of the original. That I happens wanted this image was generated with a maximum size.

Example: If I have an image with 1536px and do that process, she stays with 1075px. But I wanted her to get at most with 500px. How Could I do that?( If I decrease the 70 the smaller images stay very small )

Thanks

[omoutop]

Basically you need a thumbnail script but with larger dimensions.

$im_file_name = "../path_to_image/".$_FILES['image_file']['name'];
$image_attribs = getimagesize($im_file_name); 
$im_old = imageCreateFromJpeg($im_file_name);
$th_max_width=100; //give your dimension
$th_max_height=75; //give your dimension
$ratio = ($width > $height)? $th_max_width/$image_attribs[0] : $th_max_height/$image_attribs[1]; 
$th_width = $image_attribs[0] * $ratio; 
$th_height = $image_attribs[1] * $ratio; 
$im_new = imagecreatetruecolor($th_width,$th_height); 
$th_file_name = "../new_path_to_image/some_folder/". $_FILES['image_file']['name']; 
imageCopyResampled($im_new,$im_old,0,0,0,0,$th_width,$th_height, $image_attribs[0], $image_attribs[1]); 
imageJpeg($im_new,$th_file_name,100);

The above script will create a thumb from an uploaded image. Play around with it and adjust it to your neds

[romzinho2k7]

Hey

But in this script is the image reduces for the size of 100x75 ( it imagines if anybody does it post an image of 40x40? It is going to get distorted ) because of this that it wanted to do a dynamic system, but fixed only if it was greater than 500x375

Thanks

[omoutop]

then put the script in an if statement:

if ($image_width>500 && $image_heigh>375)
{
// execute script
}