note 117819 added to function.imagepng
| From: | ChrisF | Date: | Fri, 14 Aug 2015 04:33:49 +0000 |
| Subject: | note 117819 added to function.imagepng | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-203341@lists.php.net to get a copy of this message | ||
I was curious about the relationship between quality, processing time and resulting image size, so I
created this little benchmark to test it (The image used was originally RGB_24bits_palette_R85.png,
found on wikipedia). Results are at the bottom.
<?php
$sizes = ['32', '64', '128', '256', '512',
'1024', '2048'];
foreach ($sizes as $size) {
echo "\nSize: {$size}x{$size}px:\n";
$image = imagecreatefrompng("images/test{$size}.png");
for ($quality = 0; $quality < 10; $quality++) {
ob_start();
$start = microtime(true);
imagepng($image, null, $quality);
$elapsed = microtime(true) - $start;
$blob = ob_get_contents();
ob_end_clean();
$blobSize = strlen($blob);
echo "quality: $quality, size: $blobSize, elapsed: $elapsed\n";
}
imagedestroy($image);
}
// Results (some omitted for brevity):
// Size: 32x32px:
// quality: 0, size: 3172, elapsed: 0.00013399124145508
// quality: 1, size: 266, elapsed: 9.4890594482422E-5
// quality: 2, size: 264, elapsed: 7.7009201049805E-5
// quality: 3, size: 223, elapsed: 7.4863433837891E-5
// quality: 4, size: 225, elapsed: 8.5830688476562E-5
// quality: 5, size: 209, elapsed: 8.5115432739258E-5
// quality: 6, size: 208, elapsed: 9.608268737793E-5
// quality: 7, size: 205, elapsed: 0.0001060962677002
// quality: 8, size: 186, elapsed: 0.00015091896057129
// quality: 9, size: 181, elapsed: 0.00022006034851074
// Size: 128x128px:
// quality: 0, size: 49425, elapsed: 0.0010969638824463
// quality: 1, size: 976, elapsed: 0.00091886520385742
// quality: 2, size: 938, elapsed: 0.00088310241699219
// quality: 3, size: 925, elapsed: 0.00087594985961914
// quality: 4, size: 608, elapsed: 0.0009760856628418
// quality: 5, size: 607, elapsed: 0.00098395347595215
// quality: 6, size: 601, elapsed: 0.0010099411010742
// quality: 7, size: 602, elapsed: 0.001086950302124
// quality: 8, size: 521, elapsed: 0.001910924911499
// quality: 9, size: 491, elapsed: 0.0029060840606689
// Size: 512x512px:
// quality: 0, size: 788279, elapsed: 0.012928009033203
// quality: 1, size: 12467, elapsed: 0.013065099716187
// quality: 2, size: 11885, elapsed: 0.013008117675781
// quality: 3, size: 11190, elapsed: 0.013030052185059
// quality: 4, size: 7311, elapsed: 0.016619920730591
// quality: 5, size: 6994, elapsed: 0.016351222991943
// quality: 6, size: 6475, elapsed: 0.016234159469604
// quality: 7, size: 6432, elapsed: 0.016525983810425
// quality: 8, size: 6094, elapsed: 0.022937774658203
// quality: 9, size: 5649, elapsed: 0.065664052963257
// Size: 2048x2048px:
// quality: 0, size: 12605375, elapsed: 0.20983290672302
// quality: 1, size: 451735, elapsed: 0.19678711891174
// quality: 2, size: 409375, elapsed: 0.19415307044983
// quality: 3, size: 366404, elapsed: 0.20460414886475
// quality: 4, size: 312538, elapsed: 0.22785305976868
// quality: 5, size: 281671, elapsed: 0.23320484161377
// quality: 6, size: 244248, elapsed: 0.28935289382935
// quality: 7, size: 238310, elapsed: 0.33481192588806
// quality: 8, size: 217038, elapsed: 0.71698379516602
// quality: 9, size: 208881, elapsed: 1.858146905899
?>
----
Server IP: 72.52.91.14
Probable Submitter: 110.74.60.254
----
Manual Page -- http://php.net/manual/en/function.imagepng.php
Edit -- https://master.php.net/note/edit/117819
Del: integrated -- https://master.php.net/note/delete/117819/integrated
Del: useless -- https://master.php.net/note/delete/117819/useless
Del: bad code -- https://master.php.net/note/delete/117819/bad+code
Del: spam -- https://master.php.net/note/delete/117819/spam
Del: non-english -- https://master.php.net/note/delete/117819/non-english
Del: in docs -- https://master.php.net/note/delete/117819/in+docs
Del: other reasons-- https://master.php.net/note/delete/117819
Reject -- https://master.php.net/note/reject/117819
Search -- https://master.php.net/manage/user-notes.php