Imagick::getImageChannelExtrema

(PECL imagick 2, PECL imagick 3)

Imagick::getImageChannelExtrema — Gets the extrema for one or more image channels

警告

此函数在 Imagick 3.4.4 中被废弃，强烈建议不要应用此函数。

public Imagick::getImageChannelExtrema(int $channel): array

Gets the extrema for one or more image channels. Return value is an associative array with the keys "minima" and "maxima".

channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

成功时返回 true。

错误时抛出 ImagickException。