Imagick::getImageChannelExtrema

(PECL imagick 2, PECL imagick 3)

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

警告

此函數(shù)在 Imagick 3.4.4 中被廢棄，強烈建議不要應用此函數(shù)。

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.

成功時返回 true。

錯誤時拋出 ImagickException。