grid image pdp packet with type pattern image/YCrCb/* 0: packet with type pattern image/YCrCb/* will be converted to a grid of size (rows, columns, 3). FUTURE USE, default: 0 FUTURE USE sets the implied rightshift. (default: 7 or 8 ???) 1: packet with type pattern image/YCrCb/* will be converted to a grid of size (rows/2, columns/2, 3). FUTURE USE (default: rgb) FUTURE USE (default: int32)