# pamundice > Combine a grid of Netpbm images into one. > See also: `pamdice`. > More information: . - Combine the images whose names match the `printf`-style filename expression. Assume a grid with a specific size: `pamundice {{filename_%1d_%1a.ppm}} {{[-a|-across]}} {{grid_width}} {{[-d|-down]}} {{grid_height}} > {{path/to/output.ppm}}` - Assume that the tiles overlap horizontally and vertically by the specified amount: `pamundice {{filename_%1d_%1a.ppm}} {{[-a|-across]}} {{x_value}} {{[-d|-down]}} {{y_value}} {{[-h|-hoverlap]}} {{value}} {{[-vo|-voverlap]}} {{value}} > {{path/to/output.ppm}}` - Specify the images to be combined through a text file containing one filename per line: `pamundice {{[-l|-listfile]}} {{path/to/file.txt}} {{[-a|-across]}} {{x_value}} {{[-d|-down]}} {{y_value}} > {{path/to/output.ppm}}`