Image Interlacing is simply combining two images by layering one over the other with a certain opacity (usually 50%). The intention is to use the image in video, so that two images are displayed within one single frame, thereby doubling the frames-per-second without doubling the actual, physical amount of frames. Wikipedia provides a fairly decent explanation of this type of video technology: http://en.wikipedia.org/wiki/Interlaced_video .
Best Description :
http://www.100fps.com/
Some sample code :
<?php
// Author: holdoffhunger@gmail.com
// Imagick Type
// ---------------------------------------------
$imagick_type = new Imagick();
// Open File
// ---------------------------------------------
$file_to_grab = "image_workshop_directory/test.jpg";
$file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
// Grab File
// ---------------------------------------------
$imagick_type->readImageFile($file_handle_for_viewing_image_file);
// Get Rendering Intent Values
// ---------------------------------------------
$imagick_rendering_intent = $imagick_type->getImageRenderingIntent();
switch($imagick_rendering_intent)
{
case '0':
$image_rendering_intent_evaluated = "Undefined";
break;
case '1':
$image_rendering_intent_evaluated = "Saturation";
break;
case '2':
$image_rendering_intent_evaluated = "Perceptual";
break;
case '3':
$image_rendering_intent_evaluated = "Absolute";
break;
case '4':
$image_rendering_intent_evaluated = "Relative";
break;
}
// Print Rendering Intent Values
// ---------------------------------------------
print("# $imagick_rendering_intent - $image_rendering_intent_evaluated");
?>