Imagick::getImageAlphaChannel

(PECL imagick 2 >= 2.3.0, PECL imagick 3)

Imagick::getImageAlphaChannelChecks if the image has an alpha channel

Description

public Imagick::getImageAlphaChannel(): bool

Returns whether the image has an alpha channel.

Parameters

This function has no parameters.

Return Values

Returns true if the image has an alpha channel value and false if not, i.e. the image is RGB rather than RGBA or CMYK rather than CMYKA.

Errors/Exceptions

Throws ImagickException on error.

Changelog

Version Description
imagick 3.6.0 Returns a bool now; previously, an int was returned.
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phroggar
9 months ago
You want to check wether an image has an alpha channel? But you have no control which Imagick Version is used?

Background:

Method available since ImageMagick 6.4.0
Method returns boolean instead of int since 6.9.x

Example:

$image= new Imagick();
$image->readImage($source_file);

$imageHasAlphaChannel = (method_exists($image, 'getImageAlphaChannel') && ($document->getImageAlphaChannel() === \Imagick::ALPHACHANNEL_ACTIVATE || $document->getImageAlphaChannel()  === true));
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