Sets image alpha channel

# Imagick::setImageAlphaChannel

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

Imagick::setImageAlphaChannel — Sets image alpha channel

### Description

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

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

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

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