PHP Manual: Enable or disable interlace

Description

int imageinterlace ( resource $image [, int $interlace = 0 ] )

imageinterlace turns the interlace bit on or off.

If the interlace bit is set and the image is used as a JPEG image, the image is created as a progressive JPEG.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor.
interlace: If non-zero, the image will be interlaced, else the interlace bit is turned off.

Return Values

Returns 1 if the interlace bit is set for the image, 0 otherwise.

Examples

Example #1 Turn on interlacing using imageinterlace


<?php
// Create an image instance
$im = imagecreatefromgif('php.gif');

// Enable interlancing
imageinterlace($im, true);

// Save the interlaced image
imagegif($im, './php_interlaced.gif');
imagedestroy($im);
?>