CODEWITHSUNDEEP
phpimage
Bobby Jack
Bobby Jack

Reputation: 16048

PHP image cropping: blurry result

I'm using imagecopyresampled to resize (shrink) an image, which happens to be a gif. The image contains text which, when resized, is quite blurry. I wouldn't necessarily mind that, but when displaying the original image on a web page, at the reduced size, my browser scales it down with much nicer results. Any idea what I can do to improve what PHP produces?

UPDATE: Here's an example of the code I'm running:

$x1 = 0;
$y1 = 0;
$w1 = 196;
$h1 = 260;
$x2 = 0;
$y2 = 0;
$w2 = 140;
$h2 = 186;
$r1 = imagecreatefromgif($source);
$r2 = imagecreatetruecolor($w2, $h2);
imagealphablending($r2, false);
imagesavealpha($r2, true);
$res = imagecopyresampled($r2, $r1, $x2, $y2, $x1, $y1, $w2, $h2, $w1, $h1);
imagegif($r2, $dest);

Here's an example of the image scaled by the browser: enter image description here

Here's an example of the image scaled with the above code: enter image description here

Upvotes: 0

Views: 261

Answers (2)

puppyFlo
puppyFlo

Reputation: 445

The PHP libraries aren't going to produce the best quality resize operation however you may find you have better results if you stick to a ratio based on the original file such that resizing a 200x200 to 100x100 or 50x50 would be find as its easy maths for the process to handle (i.e. merge 2/4 pixels into one). Your current operation is producing blurry results as it'll be a random value such as scaling to 0.63% of the original size.

Upvotes: 0

user5934815
user5934815

Reputation: 11

Try to use imagepng instead of imagegif. imagepng third parameter is quality. Check specs: http://php.net/manual/en/function.imagepng.php

Upvotes: 1

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