Imagick::nextImage

(PECL imagick 2, PECL imagick 3)

Imagick::nextImage — Moves to the next image

说明

public Imagick::nextImage(): bool

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。

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User Contributed Notes 2 notes

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simonjjarrett at gmail dot com ¶

2 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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-2

markus dot s dot schmitz at gmail dot com ¶

9 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

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