Added an explanation of Metadata and colorspace to ImagePlug.
Added an explanation of Metadata and colorspace to ImagePlug.

andrewkaufman/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,goddardl/gaffer,hradec/gaffer,chippey/gaffer,johnhaddon/gaffer,boberfly/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,goddardl/gaffer,goddardl/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,goddardl/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,hradec/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,chippey/gaffer,appleseedhq/gaffer,boberfly/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,boberfly/gaffer,ivanimanishi/gaffer,hradec/gaffer,hradec/gaffer,chippey/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,chippey/gaffer,hradec/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,boberfly/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,appleseedhq/gaffer