Resize image on fly?

Mattius · 5 Sep 2006 at 21:31

im trying to resize images on the fly, is it possible?

i got hold of the image resize function which gives a file handle but is it possible to now display this?

PHP:

function resize_jpg($inputFilename, $new_side){	
$imagedata = getimagesize($inputFilename);
	$w = $imagedata[0];	$h = $imagedata[1];
		if ($h > $w) {		$new_w = ($new_side / $h) * $w;
		$new_h = $new_side;		} else {
		$new_h = ($new_side / $w) * $h;		$new_w = $new_side;
	}		$im2 = ImageCreateTrueColor($new_w, $new_h);
	$image = ImageCreateFromJpeg($inputFilename);
	imagecopyResampled ($im2, $image, 0, 0, 0, 0, $new_w, $new_h, $imagedata[0], $imagedata[1]);
	return $im2;}

Conrad11 · 5 Sep 2006 at 21:52

EDIT: lol, looks like i have totally the wrong end of the stick again. :/

totally hazzarding a guess but:

Code:

readfile($im2);

I am not sure but that function may require the filename. So you may have to do it like this:

Code:

readfile($inputFilename);

Beansprout · 5 Sep 2006 at 21:56

It will be very slow to do lots of these, dynamically, on every page load

Mattius · 5 Sep 2006 at 21:57

using the original filename would be no help as the function resizes the image and stores it in memory.
im not sure the other function would work either as i need to display it in the middle of a page

Conrad11 · 5 Sep 2006 at 21:59

Yeah looks like i have the wrong end of the stick again.

What are you actually doing and it would help (well me) to post the right thing.

Mattius · 5 Sep 2006 at 22:05

im basically taking images from a larger photo gallery and using them in posts on my blog script, i don't want the images to be too large and the images change often so i don't really want to save it, there won't be many images on each page, max prob about 6

Conrad11 · 5 Sep 2006 at 22:32

Would it not be best to temporary save them rather than do it on the fly?

As if you have a lot of people visiting the site, it will use a lot of memory or processing power....lol i don't know which one as i am a newbie at php, but i know its bad.

Mattius · 5 Sep 2006 at 22:34

hmm function just seems to return "Resource ID #14"

Mattius · 5 Sep 2006 at 22:36

i can't seem to figure out how to temporary save it then delete it when they move off the page.

robmiller · 5 Sep 2006 at 23:02

Just save them permanently as $filename-thumb.$extension or something. You really don't want to be doing this every page load, it will kill your server in about 5 seconds and probably get your hosting cancelled (I presume you're on shared hosting).

Mattius · 5 Sep 2006 at 23:07

is this not how the likes of gallery 2 work?? gallery 1 used to save the image thumbnails, gallery 2 does it on the fly.

Beansprout · 5 Sep 2006 at 23:17

Gallery2 must cache them - or at least have the option. It can also cache entire pages, too - kinda useful for 400k page impressions/day like one Gallery I host

chesterstu · 5 Sep 2006 at 23:21

I found a class that i use to create thumbnails without saving them and just displaying. Take a look here.

I use it on my site and it works quite fast

Mattius · 5 Sep 2006 at 23:42

well i sorted it now thanks, turns out my glob function wasn't quite right giving a slightly wrong filename