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(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::getImageAlphaChannel — Checks if the image has an alpha channel
У цієї функції немає параметрів.
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.
Кидає ImagickException в разі помилки.