FilterChannels FilterChannels.RED FilterChannels.GREEN FilterChannels.BLUE FilterChannels.ALPHA FilterChannels.GRAY FilterChannels.INDEX FilterChannels.RGB Same as FilterChannels.RED | FilterChannels.GREEN | FilterChannels.BLUE. FilterChannels.RGBA Same as FilterChannels.RED | FilterChannels.GREEN | FilterChannels.BLUE | FilterChannels.ALPHA. FilterChannels.GRAYA Same as FilterChannels.GRAY | FilterChannels.ALPHA.