On assignment 2

Some of the stuff mentioned:

• relevant lecture notes are from lecture 3 and 4
• data structures Img and ImgPixel can be found in img.h
• PIXEL_LUMINANCE is in img.h, useful for the dithering and the saturation filters
• for the ordered dither, just use the matrix given in Hearn & Baker (paragraph 4.4, page 516)
• fun filter suggestions:
  • warping/displacement
  • classical filters like edge detect, emboss
  xv implements a number of filters, you can use it to check the output of your filters