Imagick::setImageAlphaChannel

(No version information available, might only be in Git)

Imagick::setImageAlphaChannelSets image alpha channel

Description

bool Imagick::setImageAlphaChannel ( int $mode )

Activate or deactivate image alpha channel. The mode is one of the Imagick::ALPHACHANNEL_* constants. This method is available if Imagick has been compiled against ImageMagick version 6.3.8 or newer.

Parameters

mode

One of the Imagick::ALPHACHANNEL_* constants

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

See Also

Коментарии

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 );
?>
2020-03-25 17:09:23
http://php5.kiev.ua/manual/ru/imagick.setimagealphachannel.html

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