note 93705 deleted from function.imagecreate by googleguy

Note Submitter: dan at wow dot com ---- if you want to create an image with a specific DPI, you can't control this directly from GD. If you have access to gd.h (rarely on a shared hosting) you can modify GD_RESOLUTION and give it your desired value. The solution that I found was directly manipulating the jpeg header bytes. I hope this sample code would helps someone because it took me 5 hours of digging to figure out i have no other options. <?php header('Content-Disposition: attachment; filename="myimg.jpg"'); header('Cache-Control: private'); $dst = imagecreatetruecolor(300, 300); /*this creates a 300x300 pixels image*/ ob_start(); /*don't send the output to the browser since we'll need to manipulate it*/ ImageJpeg($dst); $img = ob_get_contents(); ob_end_clean(); //byte #14 in jpeg sets the resolution type: 0=none, 1=pixels per inch, 2=pixels per cm //bytes 15-16 sets X resolution //bytes 17-18 sets Y resolution $img = substr_replace($img, pack('cnn',1,300,300),13,5); echo $img; ?>