Richard, imageinterlace() turns the interlace bit on or off. It only returns 1 if you set it to 1 as the second parameter... Thanks Gerry On 1/24/07, Richard Lynch <ceo@xxxxxxxxx> wrote:
On Wed, January 24, 2007 12:08 am, Gerry Danen wrote: >> One other possibility is to see what happens if you do >> imagefromjpeg() >> on a progressive JPEG -- There amy be functions in GD that will tell >> you if the JPEG is progressive, once you have sucked it into PHP... > > Any idea which ones to look at? No, but a quick search on php.net for "JPEG progress" with "online documentation" from the popup yeilded: http://us3.php.net/manual/en/function.imageinterlace.php "If the interlace bit is set and the image is used as a JPEG image, the image is created as a progressive JPEG. This function returns whether the interlace bit is set for the image. " Presumably, then, this would work: <?php $filename = '/full/path/to/filename.jpg'; $jpeg = imagecreatefromjpeg($filename); $progressive = imageinterlace($jpeg); if ($progressive) echo "$filename is progressive.\n"; else echo "$filename is NOT progressive.\n"; ?>
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