resizing image files in PHP into thumbnails - efficiently

[anita999]

I have a list of items with their images displayed in a column.  I would like to resize the images into small fixed size images.  Is there a way to do this efficiently since I have about 10 items per page.  I also do not want resized images to be produced in the file directory?  Any suggestions on how to do this efficiently would be appreciated.

 

Thanks

 

 

[genericnumber1]

Well to do it efficiently you would want to save the thumbnails in a separate folder so that you wont have to dynamically resize every image on the page every time the image is requested.

 

As for actually doing the resizing, google is a great place to find tutorials...

http://www.google.com/search?q=resizing+an+image+in+php&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

[Maverickb7]

This should resize your image fairly easy. I'm sure you could come up with something better if you modified it a bit. You could set it up as a function so it'll be easy to use.

<?php
// The file you are resizing
$file = 'yourfile.jpg';

//This will set our output to 45% of the original size
$size = 0.45;

// This sets it to a .jpg, but you can change this to png or gif
header('Content-type: image/jpeg');

// Setting the resize parameters
list($width, $height) = getimagesize($file);
$modwidth = $width * $size;
$modheight = $height * $size;

// Resizing the Image
$tn = imagecreatetruecolor($modwidth, $modheight);
$image = imagecreatefromjpeg($file);
imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height);

// Outputting a .jpg, you can make this gif or png if you want
//notice we set the quality (third value) to 100
imagejpeg($tn, null, 100);
?>

[anita999]

Thank you.  I tried the sample code but when the image is printed to the screen, it prints out symbols instead of the image.

 

I tried reading in a gif file and changed all references to the code from jpeg to gif.  But that didn't work either.

[Maverickb7]

I think your using the code wrong. Create a file called thumbnail.php and place this code in. Now simply use thumbnail.php like it was an image and call it like:

 

<img src="http://www.yoursite.com/thumbnail.php">

 

this should work for you as long as you have an image called yourfile.jpg in the same directory. You could use $_GET to specific which image you wanna thumbnail as well, rather then naming a file within thumbnail.php. Hope that helps!