Imagick::setImageAlphaChannel

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Imagick::setImageAlphaChannel — Sets image alpha channel

설명

bool Imagick::setImageAlphaChannel ( int $mode )

Activate or deactivate image alpha channel. The mode is one of the Imagick::ALPHACHANNEL_* constants. 이 메쏘드는 Imagick을 ImageMagick 6.3.8 이상으로 컴파일 했을 때만 사용할 수 있습니다.

인수

mode: One of the Imagick::ALPHACHANNEL_* constants

반환값

성공시에 TRUE를 반환합니다.

오류/예외

오류시에 ImagickException이 발생합니다.

참고

Imagick::setImageMatte() - Sets the image matte channel
Imagick Alpha Channel Constants

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User Contributed Notes 1 note

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simonjjarrett at gmail dot com ¶

4 years ago


If you're having trouble with white backgrounds turning black when converting PDFs to other formats, you need to use this function with Imagick::ALPHACHANNEL_REMOVE as the parameter (this is not currently on the constants page, but it exists in PHP 7.2) to remove the alpha channel.

<?php
$im->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE );
?>

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