(define-library (pnm)
  (export make-ppm-image
          make-pgm-image
          image?
          image-type
          image-width
          image-height
          image-maxval
          image-ref
          image-set!
          image-read
          image-write)
  (import (scheme base)
          (pnm image)
          (pnm pgm)
          (pnm ppm)
          (pnm read)
          (pnm write)))