grid image FUTURE USE : sets the implied leftshift. (default: 7) FUTURE USE (default: rgb) pdp packet to be fed into a [pdp_...] box the type pattern is image/YCrCb/* 1: grid of size (y, x, 3) will be converted to a pdp image that has a Y channel of size (2y, 2x) and UV channels of size (y, x). 0: grid of size (2y, 2x, 3) will be converted to a pdp image that has a Y channel of size (2y, 2x) and UV channels of size (y, x).