Changes any pixel that matches color with the color defined by fill.
Parameters
target
Change this target color to the fill color within the image. An ImagickPixel object or a string representing the target color.
fill
An ImagickPixel object or a string representing the fill color.
fuzz
The fuzz member of image defines how much tolerance is acceptable to consider two colors as the same.
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. Defaults to Imagick::CHANNEL_ALL.