Image resizing

[dhrubajyoti]

Hi,

Can anyone help me in image resizing. I know its too easy to upload and re-size an image, but the prob comes like - the shape (pixel wise) get reduced, but the size(MB/KB) does not get reduced accordingly...

Any third party or application so that I can use it my site would have helped....

 

-Regards

Dhrubajyoti

[mga_ka_php]

use this

 

<?php
header ("Content-type: image/jpeg");
/*

    Resize an image to 25 x 25
    imgsize.php?w=25&h=25&img=path/to/image.jpg

    Resize an image to 50% the size
    imgsize.php?percent=50&img=path/to/image.jpg

    Resize an image to 50 pixels wide and autocompute the height
    imgsize.php?w=50&img=path/to/image.jpg

    Resize an image to 100 pixels tall and autocompute the width
    imgsize.php?h=100&img=path/to/image.jpg

    Resize to 50 pixels width OR 100 pixels tall, whichever resulting image is smaller
    imgsize.php?w=50&h=100&constrain=1&img=path/to/image.jpg

JPEG / PNG Image Resizer
Parameters (passed via URL):

img = path / url of jpeg or png image file

percent = if this is defined, image is resized by it's
          value in percent (i.e. 50 to divide by 50 percent)

w = image width

h = image height

constrain = if this is parameter is passed and w and h are set
            to a size value then the size of the resulting image
            is constrained by whichever dimension is smaller

Requires the PHP GD Extension

Outputs the resulting image in JPEG Format

By: Michael John G. Lopez - www.sydel.net
Filename : imgsize.php
*/

$img = $_GET['img'];
$percent = $_GET['percent'];
$constrain = $_GET['constrain'];
$w = $_GET['w'];
$h = $_GET['h'];

// get image size of img
$x = @getimagesize($img);
// image width
$sw = $x[0];
// image height
$sh = $x[1];

if ($percent > 0) {
// calculate resized height and width if percent is defined
$percent = $percent * 0.01;
$w = $sw * $percent;
$h = $sh * $percent;
} else {
if (isset ($w) AND !isset ($h)) {
	// autocompute height if only width is set
	$h = (100 / ($sw / $w)) * .01;
	$h = @round ($sh * $h);
} elseif (isset ($h) AND !isset ($w)) {
	// autocompute width if only height is set
	$w = (100 / ($sh / $h)) * .01;
	$w = @round ($sw * $w);
} elseif (isset ($h) AND isset ($w) AND isset ($constrain)) {
	// get the smaller resulting image dimension if both height
	// and width are set and $constrain is also set
	$hx = (100 / ($sw / $w)) * .01;
	$hx = @round ($sh * $hx);

	$wx = (100 / ($sh / $h)) * .01;
	$wx = @round ($sw * $wx);

	if ($hx < $h) {
		$h = (100 / ($sw / $w)) * .01;
		$h = @round ($sh * $h);
	} else {
		$w = (100 / ($sh / $h)) * .01;
		$w = @round ($sw * $w);
	}
}
}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
// We get errors from PHP's ImageCreate functions...
// So let's echo back the contents of the actual image.
readfile ($img);
} else {
// Create the resized image destination
$thumb = @ImageCreateTrueColor ($w, $h);
// Copy from image source, resize it, and paste to image destination
@ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh);
// Output resized image
@ImageJPEG ($thumb);
}
?>

[mga_ka_php]

or you could use image magick