Diffrence result of image resizing with php and photoshop

alirezaok

hi
I want to resize image with PHP. i'm using this script:

$filename = '1.jpg';
//the resize will be a percent of the original size
$percent = 5;

// Content type

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

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

// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
$quality=100;
// Output and free memory
//the resized image will be 400x300
imagejpeg($thumb, "3php.jpg", $quality);
imagedestroy($thumb);

as you see in attached files, the result of php resizer is difference when I resize it with photoshop.

photoshop make a fade stroke outline of text in image when it resized but text in image that resized with php is sharp.

I need same result of photoshop resizer. how do I it with php?

Orginal file:
[ATTACH]5205[/ATTACH]

resized with photoshop:
[ATTACH]5209[/ATTACH]

resized with PHP:
[ATTACH]5207[/ATTACH]

thanks

1.jpg 3php.jpg 3photoshop.jpg

Bonesnap

This isn't a solution for you, but maybe it will provide some insight. I have noticed differences between Paint and Photoshop as well when resizing images (Photoshop was the clear winner again). My guess is different applications are using different algorithms and some are better than others; it doesn't surprise me that Photoshop produces the best results.

Weedpacket

The manual page for [man]imagecopyresized[/man] says (discussing the quality of the output of the example code)

better quality could be obtained using imagecopyresampled().

dalecosp

I use Joseph Lencioni's SLIR ... https://github.com/lencioni/SLIR

sneakyimp

The photoshop resize looks 'better' because you resized it in such a way that an anti-aliasing algorithm is applied. This algorithm, rather than simply copying pixels, will calculate blurred intermediate pixels when attempting to size images up or down. The result looks more natural to the human eye in most cases. It is a fundamental thing to understand when you are resizing images.

As weedpacket said, consider using [man]imagecopyresampled[/man] instead of [man]imagecopyresized[/man] and you can probably get results nearly identical to photoshop.