increasing image size without effecting much of quality using gd library

[rabikhadka]

can any one suggest me how to increase image size without effecting the quality of the image. it should be at the runtime using gd library

[sspoke]

use math formulas like

 

<img src=\"width\"= $currentWidthofImage * 2  \"height\"=$currentHeightofImage * 2>

 

would double the image it self without you guessing the height or width

[rabikhadka]

thank you, but i want to use GD library for on the fly image resize

[fert]

http://us3.php.net/manual/en/function.imagecopyresampled.php

[rabikhadka]

thank you, but the image quality gets worst when increase the site. i used this code

 

<?php

// The file

$filename = '24.jpg';

$percent = 3;

 

// Content type

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

 

// Get new dimensions

list($width, $height) = getimagesize($filename);

$new_width = $width * $percent;

$new_height = $height * $percent;

 

// Resample

$image_p = imagecreatetruecolor($new_width, $new_height);

$image = imagecreatefromjpeg($filename);

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

 

// Output

imagejpeg($image_p, null, 100);

?>