(PECL imagick 2.0.0)
Imagick::randomThresholdImage — Creates a high-contrast, two-color image
$low
, float $high
[, int $channel = Imagick::CHANNEL_ALL
] )Changes the value of individual pixels based on the intensity of each pixel compared to threshold. The result is a high-contrast, two color image. Этот метод доступен, если Imagick был скомпилирован с версией ImageMagick 6.2.9 или старше.
low
The low point
high
The high point
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.
В случае успешной работы возвращает TRUE.