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    Imagick::getImageAlphaChannel

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

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

    Açıklama

    public Imagick::getImageAlphaChannel(): bool

    Returns whether the image has an alpha channel.

    Bağımsız Değişkenler

    Bu işlevin bağımsız değişkeni yoktur.

    Dönen Değerler

    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.

    Hatalar/İstisnalar

    Hata durumunda bir ImagickException istisnası oluşur.

    Sürüm Bilgisi

    Sürüm: Açıklama
    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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