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Imagick::setImageAlphaChannel

(PECL imagick 2 >= 2.1.0, PECL imagick 3)

Imagick::setImageAlphaChannelSets image alpha channel

Descrição

public Imagick::setImageAlphaChannel ( int $mode ) : bool

Activate or deactivate image alpha channel. The mode is one of the Imagick::ALPHACHANNEL_* constants. Este método está disponível se o PHP foi compilado com o ImageMagick versão 6.3.8 ou superior.

Parâmetros

mode

One of the Imagick::ALPHACHANNEL_* constants

Valor Retornado

Retorna true no sucesso.

Erros

Lança ImagickException em caso de erro.

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simonjjarrett at gmail dot com
10 months 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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