Imagick::getImageAlphaChannel

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

    Imagick::getImageAlphaChannel — Checks if the image has an alpha channel

    Beschreibung

    public Imagick::getImageAlphaChannel(): bool

    Returns whether the image has an alpha channel.

    Parameter-Liste

    Diese Funktion besitzt keine Parameter.

    Rückgabewerte

    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.

    Fehler/Exceptions

    Wirft ImagickException bei Fehlern.

    Changelog

    Version Beschreibung
    PECL imagick 3.6.0 Returns a Boolean now; previously, an Integer 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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