halftone gritty noise texture. grunge grit pixel gradient background. retro comic pixelated backdrop. black dotted sand

comic dot bitmap texture background noise halftone grain vintage grit speckle cartoon overlay grunge retro duotone manga effect digital poster old semitone grid spot dust snow pattern grainy rough vector gravel rust bg dirt paper book backdrop grungy distressed particles screen bw white gritty halfton dotted pixel gradient sand