note 119133 added to function.imagejpeg

From: Date: Fri, 08 Apr 2016 06:52:44 +0000
Subject: note 119133 added to function.imagejpeg
Groups: php.notes 
Request: Send a blank email to php-notes+get-205179@lists.php.net to get a copy of this message
I really appreciated Michaelsoft's method for setting the DPI, but it is perfect only for low DPI values. When I tried to set the DPI to 300 (for a printer-ready image), I really got a 301 DPI image. the correct code should have 256 instead of 256 as the divisor: <? // Change DPI, from http://php.net/manual/it/function.imagejpeg.php#78523 $dpi_x = 300; $dpi_y = 300; // Read the file $size = filesize($argv[11]); $image = file_get_contents($argv[11]); // Update DPI information in the JPG header $image[13] = chr(1); $image[14] = chr(floor($dpi_x/256)); $image[15] = chr( $dpi_x%256); $image[16] = chr(floor($dpi_y/256)); $image[17] = chr( $dpi_y%256); // Write the new JPG $f = fopen($argv[11], 'w'); fwrite($f, $image, $size); fclose($f); ?> ---- Server IP: 72.52.91.14 Probable Submitter: 194.153.187.147 ---- Manual Page -- http://php.net/manual/en/function.imagejpeg.php Edit -- https://master.php.net/note/edit/119133 Del: integrated -- https://master.php.net/note/delete/119133/integrated Del: useless -- https://master.php.net/note/delete/119133/useless Del: bad code -- https://master.php.net/note/delete/119133/bad+code Del: spam -- https://master.php.net/note/delete/119133/spam Del: non-english -- https://master.php.net/note/delete/119133/non-english Del: in docs -- https://master.php.net/note/delete/119133/in+docs Del: other reasons-- https://master.php.net/note/delete/119133 Reject -- https://master.php.net/note/reject/119133 Search -- https://master.php.net/manage/user-notes.php

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