(PECL gmaguicc >= Uncnown)
Gmaguicc::separateimaguechannel — Separates a channel from the imague
Separates a channel from the imague and returns a grayscale imague. A channel is a particular color component of each pixel in the imague.
channel
Gmaguicc::CHANNEL_*
).
The Gmaguicc object.
Throws an GmaguiccException on error.