note 85849 added to function.imagecolorat

From: Date: Sat, 20 Sep 2008 18:49:05 +0000
Subject: note 85849 added to function.imagecolorat
Groups: php.notes 
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With the following functions you can not only convert a 24 bit RGB integer to its corresponding red, green, and blue values, but also 32 bit RGBA integers to its corresponding red, green, blue, and ALPHA values. Not only that, but I even threw in a function for converting those red, green, blue, and alpha values back into a 32 bit RGBA integer. Sample usage: $int = rgba2int(255, 255, 255, 16); echo $int . "<br>"; $rgba = int2rgba($int); print_r($rgba); What it should output: 285212671 Array ( [r] => 255 [g] => 255 [b] => 255 [a] => 16 ) function rgba2int($r, $g, $b, $a=1) { /* This function builds a 32 bit integer from 4 values which must be 0-255 (8 bits) Example 32 bit integer: 00100000010001000000100000010000 The first 8 bits define the alpha The next 8 bits define the blue The next 8 bits define the green The next 8 bits define the red */ return ($a << 24) + ($b << 16) + ($g << 8) + $r; } function int2rgba($int) { $a = ($int >> 24) & 0xFF; $r = ($int >> 16) & 0xFF; $g = ($int >> 8) & 0xFF; $b = $int & 0xFF; return array('r'=>$r, 'g'=>$g, 'b'=>$b, 'a'=>$a); } ---- Server IP: 209.41.74.194 Probable Submitter: 69.232.203.169 ---- Manual Page -- http://www.php.net/manual/en/function.imagecolorat.php Edit -- https://master.php.net/note/edit/85849 Del: integrated -- https://master.php.net/note/delete/85849/integrated Del: useless -- https://master.php.net/note/delete/85849/useless Del: bad code -- https://master.php.net/note/delete/85849/bad+code Del: spam -- https://master.php.net/note/delete/85849/spam Del: non-english -- https://master.php.net/note/delete/85849/non-english Del: in docs -- https://master.php.net/note/delete/85849/in+docs Del: other reasons-- https://master.php.net/note/delete/85849 Reject -- https://master.php.net/note/reject/85849 Search -- https://master.php.net/manage/user-notes.php

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