Returns the maximum bounding region between images

# Imagick::compareImageLayers

(PECL imagick 2, PECL imagick 3)

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

### Description

public 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. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.

### Parameters

`method`

  One of the layer method constants.

### Return Values

Returns `true` on success.

### Errors/Exceptions

Throws ImagickException on error.

### Examples

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 */
?>`

### See Also

- Imagick::optimizeImageLayers() - Removes repeated portions of images to optimize
- Imagick::writeImages() - Writes an image or image sequence
- Imagick::writeImage() - Writes an image to the specified filename

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