Help with Image Resizing - searched, read, still can't get it to work!

[rastem]

Hello fellow PHPites!

I've gone through both this php forum and google searches on every permutation of "image resize php" imaginable and can't figure out what I'm doing wrong. Been at this three days now. Each time I run this image resizing script, the resized image is not uploaded. Someone please look this over and let me know what I'm doing wrong! This script below is included in a file upload script that does work (images are uploaded fine without being resized, but once this script is included, nothing happens).

TIA to all!

Ras.

<?php

$image = $HTTP_POST_FILES['img']['tmp_name'];
$image_name = $HTTP_POST_FILES['img']['name'];
$image_size = $HTTP_POST_FILES['img']['size'];
$image_type = $HTTP_POST_FILES['img']['type'];

$type = substr($image_type, 6);

// max_width and max_height set on upload script
if (!$max_width)
  echo "No max width specified!";exit;
if (!$max_height)
	echo "No max height specified!";exit;

$size = GetImageSize($image);
$width = $size[0];
$height = $size[1];

$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;

if ( ($width <= $max_width) && ($height <= $max_height) ) {
  $tn_width = $width;
  $tn_height = $height;
}
else if (($x_ratio * $height) < $max_height) {
  $tn_height = ceil($x_ratio * $height);
  $tn_width = $max_width;
}
else {
  $tn_width = ceil($y_ratio * $width);
  $tn_height = $max_height;
}

if ($type == 'jpeg')
{$src = ImageCreateFromJpeg($image);}
elseif ($type == 'png')
{$src = ImageCreateFromPng($image);}
$dst = ImageCreateTrueColor($tn_width, $tn_height);
ImageCopyResampled($dst, $src, 0, 0, 0, 0,
    $tn_width, $tn_height, $width, $height);
if ($type == 'jpeg')
{imagejpeg($dst, $new_graphic, 100);}
elseif ($type == 'png')
{imagepng($dst, $new_graphic, 100);}
ImageDestroy($dst);
ImageDestroy($src);
?>

[rastem]

Any image experts out there willing to help?

[insectis]

Hey, I don't know if this will be what you're looking for, but it's worth a shot 😉.

A while back I had the same problem you've run into. If I included the script on the upload, it wouldn't work on certain machines (predominantly Macs), but image uploading worked fine if I didn't use the script.

Here's what I did as a sort of compromise. I allowed a normal image upload, I just capped the image size at 150k or so, to make sure that large images weren't allowed. Then I resized the image on the fly when the page loaded. It now works every time without a problem, so give it a shot, you may like the results 😉.

Here's my code for image resizing, stored in resizeimage.php:

<?
	if (!$max_width)
		$max_width = 150;
	if (!$max_height)
		$max_height = 100;

$size = GetImageSize($image);
$width = $size[0];
$height = $size[1];

$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;

if (($width <= $max_width) && ($height <= $max_height)) {
	$tn_width = $width;
	$tn_height = $height;
} elseif (($x_ratio * $height) < $max_height) {
	$tn_height = ceil($x_ratio * $height);
	$tn_width = $max_width;
} else {
	$tn_width = ceil($y_ratio * $width);
	$tn_height = $max_height;
}

$src = ImageCreateFromJpeg($image);
$dst = imagecreatetruecolor($tn_width, $tn_height);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);

//USE THE TWO LINES BELOW, IF IMAGECREATETRUECOLOR DOESN'T EXIST
//$dst = ImageCreate($tn_width, $tn_height);
//ImageCopyResized($dst, $src, 0, 0, 0, 0, $tn_width, $tn_height, $width, $height);

ImageJpeg($dst);
ImageDestroy($src);
ImageDestroy($dst);

?>

And here's the image call that I use when loading an image:

print "<img src=\"resizeimage.php?image=ImageName.jpg&max_width=50&max_height=77\" border=\"0\">";

[rastem]

Sounds like the problem I'm having, and it's strange that it won't work on macs. I'm coding on a mac using wysiwyg editor, but PHP should be platform-independant (especially when the computer actually processing the PHP is a *nix box).

Thanks for the post, insectis! I was beginning to feel the situation was hopeless and I'd have to do the resizing manually in photoshop (which is slower and more labor intensive). I may end up using your method, and keeping the larger images on the server for serving to the static article pages that I have. That way there are thumbs on the "teaser" descriptions for the articles and actual beefy images on the real pages...but we'll see.

I'm not marking the thread resolved yet. I know this question has been asked a host of times (already read through most of the posts regarding similar situations). I'd love to hear some more ideas on how to get image resizing on-the-fly to work with gd lib, and hopefully this post can help others.

FYI, I'm pretty sure the *nix box has gd 2+ compiled, so feel free to use all the latest doodads on there (like ImageCreateTrueColor(), etc.)

Any help is greatly appreciated, and keep this forum rockin'

Ras.

[rastem]

Regardless of the above, I'm still having trouble resizing an image before it is uploaded to a proper directory with the above script. Any help out there? Insectis' idea is a good one, but I need the files that are actually on the server to be resized, not simply resized in the html. I'm taking his idea to cap the image sizes and display thumbs, but I still need a way to make sure the images uploaded to the server are a certain size.

Again, my PHP for the image resizing. For some reason my image uploading script stops as soon as this is included in it:

<?php

// the temporary spot where image is uploaded onto server
$image = $HTTP_POST_FILES['graphic']['tmp_name']; 
$type = substr($graphic_type, 6);

// these are specified depending on the use of the image, whether for an article or author, etc.
if (!$max_width)
  echo "No max width specified!";exit;
if (!$max_height)
	echo "No max height specified!";exit;

$size = GetImageSize($image);
$width = $size[0];
$height = $size[1];

$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;

if ( ($width <= $max_width) && ($height <= $max_height) ) {
  $tn_width = $width;
  $tn_height = $height;
}
else if (($x_ratio * $height) < $max_height) {
  $tn_height = ceil($x_ratio * $height);
  $tn_width = $max_width;
}
else {
  $tn_width = ceil($y_ratio * $width);
  $tn_height = $max_height;
}

if ($type == 'jpeg')
{$src = ImageCreateFromJpeg($image);}
elseif ($type == 'png')
{$src = ImageCreateFromPng($image);}
$dst = ImageCreateTrueColor($tn_width, $tn_height);
ImageCopyResampled($dst, $src, 0, 0, 0, 0,
    $tn_width, $tn_height, $width, $height);

// creates new resized image in same spot as last image, should this be different?
if ($type == 'jpeg')
{imagejpeg($dst, $image);}
elseif ($type == 'png')
{imagePng($dst, $image);}
ImageDestroy($dst);
ImageDestroy($src);
?>

Please help!

[TGLMan]

I was told to install gd-lib on my system to be able to resize!