Imagick::compareImageLayers

(PECL imagick 2.0.0)

Imagick::compareImageLayers — Returns the maximum bounding region between images

说明

Imagick::compareImageLayers ( int $method ) : Imagick

Compares each image with the next in a sequence and returns the maximum bounding region of any pixel differences it discovers. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

参数

method

One of the layer method constants.

返回值

成功时返回 TRUE。

错误／异常

错误时抛出 ImagickException。

范例

Example #1 Using Imagick::compareImageLayers()

Comparing image layers

<?php
/* create new imagick object */
$im = new Imagick("test.gif");

/* optimize the image layers */
$result = $im->compareImageLayers(imagick::LAYERMETHOD_COALESCE);

/* work on the $result */
?>

参见

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