note 106642 added to function.imagecolorallocatealpha
| From: | BenZemm at osu1 dot php dot net | Date: | Thu, 24 Nov 2011 02:40:49 +0000 |
| Subject: | note 106642 added to function.imagecolorallocatealpha | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-184647@lists.php.net to get a copy of this message | ||
"This was stored as 8bit where 0 is completely transparant, and 255 is complete opaque."
This would be a lot more efficient:
<?php
$alpha7 = ((~((int)$alpha8)) & 0xff) >> 1;
?>
where alpha8==255, alpha7==0
where alpha8=127, alpha7== 64
where alpha8==0, alpha7==127
----
Server IP: 117.104.162.229
Probable Submitter: 14.202.131.23 (proxied: 14.202.131.23)
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Manual Page -- http://www.php.net/manual/en/function.imagecolorallocatealpha.php
Edit -- https://master.php.net/note/edit/106642
Del: integrated -- https://master.php.net/note/delete/106642/integrated
Del: useless -- https://master.php.net/note/delete/106642/useless
Del: bad code -- https://master.php.net/note/delete/106642/bad+code
Del: spam -- https://master.php.net/note/delete/106642/spam
Del: non-english -- https://master.php.net/note/delete/106642/non-english
Del: in docs -- https://master.php.net/note/delete/106642/in+docs
Del: other reasons-- https://master.php.net/note/delete/106642
Reject -- https://master.php.net/note/reject/106642
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