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
);
?>
Imagick::nextImage
(PECL imagick 2, PECL imagick 3)
Imagick::nextImage — Moves to the next image
说明
Associates the next image in the image list with an Imagick object.
参数
此函数没有参数。
返回值
成功时返回 true。
add a note
User Contributed Notes 2 notes
simonjjarrett at gmail dot com ¶
4 years ago
markus dot s dot schmitz at gmail dot com ¶
11 years ago
Convert PDF to JPG page-wise:
<?php
$i = 0;
$imagick = new Imagick();
$imagick->readImage('myfile.pdf');
while($imagick->hasNextImage()) {
$imagick->writeImage(++$i.'-converted.jpg', false);
$imagick->nextImage();
}
?>
See also: http://php.net/manual/en/imagick.readimage.php
