Thumbnail Making Script

[cosmic_sniper]

I would be needing different picture sizes on different pages on my site but saving different sizes of a single pic is space consuming.

 

I've heard that it's possible to automatically adjust the size of the picture and found a script that ought to make that possible. Unfortunately, it did not work for me.

 

Article: PHP Thumbnail Script Using GD http://www.rainbodesign.com/pub/thumbnails/

 

Here's the code:

<?
// Rainbo Design PHP Thumbnail Maker
// Copyright (C) 2005-2010 by Richard L. Trethewey - [email protected]
// All Rights Reserved
// If you use this script, I'd appreciate a link!
// http://www.rainbodesign.com/pub/

// Defaults
$thumbsize = 150;	 // Default thumbnail width.
$imagesource = 'images/default_img.jpg';	// Default image file name.
// Set to empty string for no image output on failure.
$error = '';

if (isset($_GET['width'])) { $thumbsize = $_GET['width']; }
if (isset($_GET['src'])) { $imagesource = $_GET['src']; }

$filetype = substr($imagesource,strlen($imagesource)-4,4);
$filetype = strtolower($filetype);

if (file_exists($imagesource)) {

if($filetype == ".gif") $image = @imagecreatefromgif($imagesource); 
if($filetype == ".jpg") $image = @imagecreatefromjpeg($imagesource); 
if($filetype == ".png") $image = @imagecreatefrompng($imagesource);

$imagewidth = imagesx($image);
$imageheight = imagesy($image); 

if ($imagewidth >= $thumbsize) {
$thumbwidth = $thumbsize;
$factor = $thumbsize / $imagewidth;
$thumbheight = floor($imageheight * $factor);
} else {
$thumbwidth = $imagewidth;
$thumbheight = $imageheight;
$factor = 1;
}

// Create a thumbnail-sized GD Image object
$thumb = @imagecreatetruecolor($thumbwidth,$thumbheight);

// bool imagecopyresized ( resource dst_image, resource src_image, int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h )
imagecopyresized($thumb, $image, 0, 0, 0, 0, $thumbwidth, $thumbheight, $imagewidth, $imageheight);

// Send output to user as a jpeg type, regardless of original type
header("Content-type:image/jpeg;");
imagejpeg($thumb);
imagedestroy($image);
imagedestroy($thumb);
} else {
$error = "File $imagesource Not Found";
} // endif file_exists

if ($error != '') {
header('Content-type:text/plain;');
echo($error);
exit;
} // endif $error

?>

 

And here's a little instruction (which I have followed as well).

All it takes is replacing the "src" parameter in the <img> tag with the URL for the PHP script, including the parameters "src" which contains the path to the original image file, and "color" to select the color for the font. The script also supports a "width" parameter to specify the width of your thumbnail image. Using that script to display the above image as a thumbnail by setting the "src" attribute to "makeThumb.php?src=slides/slide1.jpg", we get the resulting image shown on the right.

 

Can anyone please help me with this script or something similar?

 

Thanks in advance.

 

Edit: The problem is that the image is not showing. It appears as if it cannot locate the file source.

[dmikester1]

So this line is failing?

if (file_exists($imagesource)) {

[xyph]

In most cases, disk space is less valuable than CPU time. Is there any reason in particular you need to save disk space? Thumbnails shouldn't take up more than ~30KB each. That's nearly 2,000 thumbnails that can fit into a 50MB space.

I'd suggest resizing the images once and saving, rather than doing it on the fly.

 

Keep in mind, the script you've posted allows a user to output any image that PHP has access to, including ones outside of your web-root.

 

script.php?src=../../../premium/some_premium_image.jpg

[cosmic_sniper]

Well, the reason why I intend to do it using a script is for it to be more convenient and easier to maintain. The website I'm working on has quite a number of images on it and these images would be reflected on different pages with different size that would be needed. In addition to that these images are being updated / replaced from time to time. So, having a single image file and a script that would manage the size of the image would be great.

 

But since you pointed it out, I think having a PHP script with such access (access beyond web-root) is the reason why it's not working on the server. I'm using a shared hosting service which prevents such access (necessarily).

 

Is there any other script that might be able to achieve the goal that I wanted or do I really have to resort to saving multiple files?

[GiGalo]

I don't mean to confuse you or anything but this code works great for me. Just put in a directory with the page that includes it and in the same directory put you img and thumbs file.

 

<?php

function createThumbs(){

$imgPath = "imgs/";
$thumbPath = "thumbs/";
$thumbsWidth = 100;

$imgDir = opendir( $imgPath );

        while ( false != ($dirContents = readdir( $imgDir ))){
        	 
        	$imgInfo = pathInfo( $imgPath . $dirContents );
        	
        	/*strtolower converts a string to all lowercase; pathInfo
        	  returns an array of info on file path; in this case pathInfo['extension']
        	  returns the file extension */
        	if ( strtolower( $imgInfo['extension']) == 'jpg' )
        	{
        		$jpgImg = imagecreatefromjpeg( "{$imgPath}{$dirContents}" );
        		$imgWidth = imagesx( $jpgImg );
        		$imgHeight = imagesy( $jpgImg );
        		
        		$new_width = $thumbsWidth;
        		$thumbsHeight = floor( $imgHeight * ($new_width/$imgWidth ));
        		
        		$tmp_img = imagecreatetruecolor( $thumbsWidth, $thumbsHeight );
        		imagecopyresized( $tmp_img, $jpgImg, 0, 0, 0, 0, $new_width, $thumbsHeight, $imgWidth, $imgHeight );
        	        imagejpeg( $tmp_img, "{$thumbPath}{$dirContents}" );
        	}        	
        	
         }
        closedir( $imgDir );	
}

createThumbs();



function imgGallery(){

$imgPath = "imgs/";
$thumbsPath = "thumbs/";

$thumbDir = openDir( $thumbsPath );

        
        $filname = $imgInfo['filname'];

//while not the end of the directories
echo "<table align=\"center\">";
echo "<tr>";
while ( False !== ($thumbDirContents = readDir( $thumbDir ))){
	$imgInfo = pathInfo( $thumbsPath . $thumbDirContents );
      	
	if (strtolower( $imgInfo['extension']) == 'jpg'){	
	        echo "<td>";
		echo "<img class=\"smallie\" src=\"{$thumbsPath}{$thumbDirContents}\" />";
		echo "</td>";

		$counter += 1;
                 if ( $counter % 5 == 0 ) { echo "</tr><tr>"; }

	}
           }
           echo "</tr>";
           echo "</table>";
     				
       
           closeDir ( $thumbDir );
           
           
}


?>

[cosmic_sniper]

GiGalo,

 

I don't fully understand how to use the code? Should I replace the values used for every image that I work on? Or should I call unto the script? How? Sorry if kinda dumb question. . . complete newbie here.

[litebearer]

might also look at... http://www.binarymoon.co.uk/2010/08/timthumb/