<Tr> <Th> PNG </Th> <Td> Pixel </Td> <Td> Raster </Td> <Td> No </Td> <Td> N / A </Td> <Td> Implicit when density is set </Td> <Td> Optional PPM, 4 bytes each horizontal and vertical directions </Td> </Tr> <Tr> <Th> PPM </Th> <Td> Pixel </Td> <Td> Raster </Td> <Td> Yes </Td> <Td> No </Td> <Td> No </Td> <Td> No </Td> </Tr> <Tr> <Th> PSD and PSB </Th> <Td> Length or Pixel </Td> <Td> Both </Td> <Td> No </Td> <Td> N / A </Td> <Td> Explicit for length . No for pixel </Td> <Td> Optional </Td> </Tr> <Tr> <Th> SVG </Th> <Td> Length or Pixel </Td> <Td> Both </Td> <Td> Yes </Td> <Td> No </Td> <Td> Explicit for length. * No for pixel </Td> <Td> Implicit for included raster images </Td> </Tr>

How many pixels per cm for high resolution