Outputs grid dimensions (columns, row, channels). The received grid is output as a one dimensional grid representing grid dimensions. For example, a grid sized like dim(240, 320, 4) [#dim] will return a grid like dim(3) whose values are 240, 320, 4 Returns list of dimensions as a grid. Given a grid sized like Dim(240, 320, 4), [#dim] will return a grid like Dim(3), whose values are 240, 320, 4 . ignores any data contained within. sends a grid dim(length of dims) containing dims.