[RESOLVED] Image size reduction

penguindark

Alright, so I have found code that does image size reduction well.

<code>
<?php
// File and new size
$filename = 'test.jpg';
$percent = 0.5;

// Content type
header('Content-type: image/jpeg');

// Get new sizes
list($width, $height) = getimagesize($filename);
$newwidth = $width $percent;
$newheight = $height $percent;

// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = imagecreatefromjpeg($filename);

// Resize
imagecopyresampled($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

// Output

imagejpeg($thumb,$save_to,100);

</code>

Pretty standard and it works well ... on its own. But if there is anything else on the page, like text, it outputs

The image “...photo_folder_open.php” cannot be displayed, because it contains errors.

or it just doesn't dislpay the text at all.

Probably because of the header call --> header('Content-type: image/jpeg'). But why does the entire page have to be that content type. I would like to be able to do something like <img src='$save_to'> and have it print out the size modified jpeg.

Although I have been reading that the $save_to variable is the 'file' that should be receiving the JPG data I can't seem to get it to output after it has been "written to".

bradgrafelman

Uh, where is $save_to being set?

Also, what are you trying to do - do you want to save this newly generated image to a file, or just display it?

If you want to display it, you can't have HTML outputted by this script, because this script is outputting binary data to show the image. You'll have to make a separate file that outputs the text and whatnot, and you'd use <img src="image.php">.

Weedpacket

bradgrafelman wrote:
you can't have HTML outputted by this script

I think the <code>...</code> tags were supposed to be [code]...[/code] tags, but the poster hadn't checked that after posting. I'd stick with the rest of your reply; if you save the file, it isn't output.

bradgrafelman

Right, I was referring to his question:

penguindark wrote:
But why does the entire page have to be that content type. I would like to be able to do something like <img src='$save_to'> and have it print out the size modified jpeg

penguindark

What I want to do is to make a thumbnail of an image that I am reading from my server. This will be done multiple times (in a loop) because there will be a number of pictures that I want on the same page ... and I only want to load small versions of them.

So, my intention is to pull down the $image from the server and then use the image reduction code that I posted previously to create a $thumbnail_image that I can then display on the page.

So one question is how do I get the resize code to produce a string variable like the form that I started with that I can use in html (e.g., <img src=''>) and display on the webpage? or is there another method for that?

It seems like all this resize program does is accomodate for the display of one image (and no text allowed because of the required header statement letting the brower know the type is an image/jpeg) and no more than that.

To bradgrafelman:
I don't want to send $save_to anywhere I just want the resize part of the code to write it to the $save_to variable so that I can use it later in the same code. Does that work?

To Weedpacket:
I want to save the file as $thumbnail_image and then have the ability to use it later in the code as HTML in <img src=''>

Paul_F

As the others have said, the best way to do this is to save the code as a separate file (call it thumbnail.php).

Two things you need to do first:
1) Make sure you change imagejpeg($thumb,$save_to,100) to imagejpeg($thumb,"",100).
2) Allow a filename to be specified dynamically within the thumbnail.php script. So change

$filename="test.jpg";

 if isset($_GET["filename"]) $filename=$_GET["filename"].".jpg";

Now just call the thumbnail script from anywhere like this:

<img src="thumbnail.php?filename=test">

penguindark

that totally worked! I just didn't get it the first time ... needed a little more guidance. Thanks all, really appreciate it!

scrypte

Hmm i'll try that