Imagick::orderedPosterizeImage

(PECL imagick 2.2.2)

Imagick::orderedPosterizeImage — Performs an ordered dither

说明

bool Imagick::orderedPosterizeImage ( string $threshold_map [, int $channel = Imagick::CHANNEL_ALL ] )

Performs an ordered dither based on a number of pre-defined dithering threshold maps, but over multiple intensity levels, which can be different for different channels, according to the input arguments. 此方法在Imagick基于ImageMagick 6.3.1以上版本编译时可用。

参数

threshold_map: A string containing the name of the threshold dither map to use
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.

返回值

成功时返回 TRUE。

错误／异常

错误时抛出 ImagickException。