Req #66887 [Com]: imagescale - poor quality of scaled image

From: Date: Wed, 12 Mar 2014 11:18:17 +0000
Subject: Req #66887 [Com]: imagescale - poor quality of scaled image
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-184747@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=66887&edit=1

 ID:                 66887
 Comment by:         mruz at poczta dot onet dot pl
 Reported by:        mruz at poczta dot onet dot pl
 Summary:            imagescale - poor quality of scaled image
 Status:             Feedback
 Type:               Feature/Change Request
 Package:            GD related
 Operating System:   openSUSE 13.1
 PHP Version:        5.5.10
 Block user comment: N
 Private report:     N

 New Comment:

Bundled, x86_64


Previous Comments:
------------------------------------------------------------------------
[2014-03-12 11:12:15] pajoye@php.net

Looks like a bug.

Which gd do you use? Bundled or system? See phpinfo

I also need to know which architecture you use (cpu)

------------------------------------------------------------------------
[2014-03-12 11:02:25] mruz at poczta dot onet dot pl

Sorry, http://mruz.pl/test/tmp0.jpg , available file
names: tmp[0-20].jpg

------------------------------------------------------------------------
[2014-03-12 10:55:56] pajoye@php.net

and which result do you get? link pls

------------------------------------------------------------------------
[2014-03-12 10:37:20] mruz at poczta dot onet dot pl

$algs = [
IMG_BELL,
IMG_BESSEL,
IMG_BICUBIC,
IMG_BICUBIC_FIXED,
IMG_BILINEAR_FIXED,
IMG_BLACKMAN,
IMG_BOX,
IMG_BSPLINE,
IMG_CATMULLROM,
IMG_GAUSSIAN,
IMG_GENERALIZED_CUBIC,
IMG_HERMITE,
IMG_HAMMING,
IMG_HANNING,
IMG_MITCHELL,
IMG_POWER,
IMG_QUADRATIC,
IMG_SINC,
IMG_NEAREST_NEIGHBOUR,
IMG_WEIGHTED4,
IMG_TRIANGLE,
];

foreach ($algs as $key => $alg) {
    $img = imagescale($oryginal, 600, 400, $alg);
    imagejpeg($img, 'tmp'.$key.'.jpg', 90);
    echo '<img src="tmp'.$key.'.jpg" /><br />';
}

All images are the same...

------------------------------------------------------------------------
[2014-03-12 10:20:24] pajoye@php.net

Please ignore the background call. It is totally unrelated to this problem. JPEG does not have
alpha, so could you please using only the scale function and compare the results?

See http://www.php.net/imagesetinterpolation
for the different algorithms available.

------------------------------------------------------------------------


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