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simonjjarrett at gmail dot com
5 years ago
The following function applies a callback to each image in an Imagick object.

<?php
function imagickMap($callback, $im)
{
$im->setFirstIterator();

do
{
$callback($im);
}
while (
$im->nextImage() );
}
?>

E.g. to convert a series of images to grayscale:

<?php
imagickMap
(
function(
$im)
{
$im->setImageType(Imagick::IMGTYPE_GRAYSCALEMATTE);
},
$im
);
?>

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