(PECL imagick 2.0.0) Checks if the current item is valid

(PECL imagick 2.0.0) Gets the number of unique colors in the image

(PECL imagick 2.0.0) Gets the object interlace scheme

(PECL imagick 2.0.0) Forces all pixels below the threshold into black

(PECL imagick 2.0.0) Returns the image profiles

(PECL imagick 2.0.0) Sets the image chromaticity green primary point

(PECL imagick 2.2.1) Gets channel range array

(PECL imagick 2.0.0) Selects a threshold for each pixel based on a range of intensity

(No version information available, might only be in Git) Gets the gravity

(PECL imagick 2.0.0) Change the contrast of the image