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Imagick::getImageAlphaChannel

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

Imagick::getImageAlphaChannelChecks if the image has an alpha channel

Descrição

public Imagick::getImageAlphaChannel(): bool

Returns whether the image has an alpha channel.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

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.

Erros/Exceções

Lança uma exceção ImagickException em caso de erro.

Registro de Alterações

Versão Descrição
imagick 3.6.0 Returns a bool now; previously, an int was returned.
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User Contributed Notes 1 note

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phroggar
2 years 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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