Image Resizing

[cap97]

Working with this script:

$oldimg = ImageCreateFromjpeg("$imgfile");
$dw = ImageSX($oldimg);
$dh = ImageSY($oldimg);

if ((!$width) && (!$height)) {
     if ($dw > $dh) {
         $aspect = $dh / $dw;
         $tmp = $thumbnailmax * $aspect;
         $neww = $thumbnailmax;
         $newh = round($tmp,0);
     }
     else {
         $aspect = $dw / $dh;
         $tmp = $thumbnailmax * $aspect;
         $newh = $thumbnailmax;
         $neww = round($tmp,0);
     }
}
else {
     if ($width) {
         $aspect = $dh / $dw;
         $tmp = $width * $aspect;
         $neww = $width;
         $newh = round($tmp,0);
     }
     if ($height) {
         $aspect = $dw / $dh;
         $tmp = $height * $aspect;
         $newh = $height;
         $neww = round($tmp,0);
     }
     if (($width) && ($height)) {
         $neww = $width;
         $newh = $height;
     }
}

$newimg = imagecreate($neww,$newh);

ImageCopyResized($newimg,$oldimg,0,0,0,0,$neww,$newh,$dw,$dh);

header("Content-Type:  image/jpeg");

imagejpeg($newimg); 

It works with mixed results:

http://www.livinglegend.net/test.php

As you can see, it resizes no problem, but it screws up the coloring in the process. Any ideas on how to refine this script to deal with that issue?

Mike....

[cap97]

Man, I answered my own question. That might be a first. 🙂 Instead of...

$newimg = imagecreate($neww,$newh);

I switched it to...

$newimg = imagecreatetruecolor($neww,$newh);

And now it works

http://www.livinglegend.net/test.php

Now how to add a border...

Mike....

[ph8edsicness]

Would this work if I wanted to link a thumbnail to the original image? i.e.

image_thumb linked to image_original to open in a new window?

[cap97]

Yeah that's exactly what it's for. As long as you have GD and PHP. Just copy/paste the below code into a file called "image.php" (or whatever you want) and then call it out on any page by using a standard HTML image command, such as:

<IMG SRC=/PATH/TO/image.php?imgfile=PATH/TO/your_image.jpg>

or

<IMG SRC=/PATH/TO/image.php?imgfile=PATH/TO/your_image.jpg&width=100>

or

<IMG SRC=/PATH/TO/image.php?imgfile=PATH/TO/your_image.jpg&height=207>

or

<IMG SRC=/PATH/TO/image.php?imgfile=PATH/TO/your_image.jpg&width=151&height=800>

or

<IMG SRC=/PATH/TO/image.php?imgfile=PATH/TO/your_image.jpg&thumbnailmax=245>

Here's the code...

<?php

$oldimg = ImageCreateFromjpeg("$imgfile");
$dw = ImageSX($oldimg);
$dh = ImageSY($oldimg);

if ($thumbnailmax) 
{
 if ($dw > $dh) 
 {
  $aspect = $dh / $dw;
  $tmp = $thumbnailmax * $aspect;
  $neww = $thumbnailmax;
  $newh = round($tmp,0);
 }
 else 
 {
  $aspect = $dw / $dh;
  $tmp = $thumbnailmax * $aspect;
  $newh = $thumbnailmax;
  $neww = round($tmp,0);
 }
}
elseif (($width) OR ($height)) 
{
 if ($width) 
 {
  $aspect = $dh / $dw;
  $tmp = $width * $aspect;
  $neww = $width;
  $newh = round($tmp,0);
 }
 if ($height) 
 {
  $aspect = $dw / $dh;
  $tmp = $height * $aspect;
  $newh = $height;
  $neww = round($tmp,0);
 }
 if (($width) && ($height)) 
 {
  $neww = $width;
  $newh = $height;
 }
}
else 
{
 $aspect = $dh / $dw;
 // CHANGE $width TO PREDETERMINED WIDTH SIZE OR LEAVE AS $dw TO DISPLAY TRUE SIZE WITHOUT URL VARIABLE
 $width = $dw;
 $tmp = $width * $aspect;
 $neww = $width;
 $newh = round($tmp,0);
}

$newimg = imagecreatetruecolor($neww,$newh);

ImageCopyResized($newimg,$oldimg,0,0,0,0,$neww,$newh,$dw,$dh);

header("Content-Type:  image/jpeg");

imagejpeg($newimg); 


?>