resize and crop image on fly through server-sive scripting PHP

Posted on 2004-08-27
Last Modified: 2012-08-13
How to crop and resize the image submitted by the user, through the form using PHP, on the fly?
Question by:millisami
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LVL 33

Expert Comment

ID: 11913642
You should have the GD library installed.  Crop and resize in one step using imagecopyresized().

Expert Comment

ID: 11913656
You need imagemagick installed on the machine you're php'ing on.  Imagemagick is a powerful command line image editor.
You'll have to look through imagemagick manuals to figure out how it works..

Try running "convert", if it does something, that's imagemagick.

Umm..  to run from perl..
something like:
$somevariabletocatchoutput = shellexec("convert imagename -optionstoresizecropwhatever newimagename");

Expert Comment

ID: 11916937
The best way is just use the build in GD functions.  Specifically the ImageCopyResize function, or for better results the ImageCopyResampled.  It will take an existing image and resize it, placing it into a new image.  Resampled will look better then resized.

To resize your image,

1. upload the image file.
2. open the uploaded file, using ImageCreateFromJpeg or something similar
3. create a new image of the desired size using ImageCreate
4. using ImageCopyResize, or ImageCopyResampled to copy the uploaded image into the new size
5. Use ImagePNG, ImageJPEG or similar to output your image.

Checks these links for more information...

The PHP Manual on resize and resample functions 

General Tutorial on using GD

Specific Tutorial on using GD to resize images, with working demos
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Accepted Solution

iceboxman earned 125 total points
ID: 11917659
Try the code below.
Put this into a file called something like thumb.php
To use:

thumb.php?img=mypicture.gif?w=150 to set picture to width of 150 and adjust height propotionally
thumb.php?img=mypicture.gif?h=150 to set picture to height of 150 and adjust width propotionally
thumb.php?img=mypicture.gif to set picture to the default height and adjust width propotionally

$defaultheight = 75;
$img = @$HTTP_GET_VARS["img"];
$TNheight = @$HTTP_GET_VARS["h"];
$TNwidth = @$HTTP_GET_VARS["w"];
      $imagehw = getimagesize($img);
      $imagewidth = $imagehw[0];
      $imageheight = $imagehw[1];

if(!empty($TNheight)) {
      $t_height = $TNheight;
      $t_width = floor($imagewidth * ($t_height / $imageheight));   // Thumbnail width (Keep Proportional)
elseif(!empty($TNwidth)) {
      $t_width = $TNwidth;
      $t_height = floor($imageheight * ($t_width / $imagewidth));   // Thumbnail height (Keep Proportional)
else {
      $t_height = $defaultheight;  // Default Thumbnail height
      $t_width = floor($imagewidth * ($t_height / $imageheight));   // Thumbnail width (Keep Proportional)

// get and display jpeg images
if(stristr($img,".jpg") || stristr($img,".jpeg")){
     header("Content-type: image/jpeg");
     $srcimage = imagecreatefromjpeg($img);
     $height = imageSY($srcimage);
     $width = imageSX($srcimage);
     $destimage = imagecreatetruecolor($t_width,$t_height);
     imagecopyresampled ($destimage,$srcimage,0,0,0,0,$t_width,$t_height,$width,$height);
     header("Content-type: image/gif");
     $srcimage = imagecreatefromgif($img);
     $destimage = imagecreate(100,100);
     $width = imageSX($srcimage);
     $height = imageSY($srcimage);
     imagecopyresized ($destimage,$srcimage,0,0,0,0,$t_width,$t_height,$width,$height);
// on a problem geneterate an image with ERROR in it
else {
$im = imagecreatetruecolor(75, 125);
$blue = imagecolorallocate($im,0,0,200);
$red = imagecolorallocate($im,255,0,0);


Expert Comment

ID: 11917699
Yeah, there you go.  iceboxman even added error checking.  You just have to wrap it with add your file upload script.
LVL 11

Expert Comment

ID: 11924568

BEST resizing watermarking etc... module on the NET!

if you need help you can contact the developer hes very helpful!
LVL 11

Expert Comment

ID: 11924572
BTW the methods IceBoxMan said probably wont work with every type of image.


I have a working demo:

I use it all the time!
its great!

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