Data representation puzzle

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Across
  1. 2. The smallest addressable part in an image
  2. 4. Hiding somthing within another thing
  3. 7. Set Has lots of letters uses encoding
  4. 11. You can see little boxes if you zoom in on a picture like this
  5. 14. Could be a face
  6. 15. 128 letters
  7. 16. How round a corner is
  8. 17. Can be used on a cereal box
  9. 18. B=11
  10. 19. You can use theses so things aren't black and white
  11. 20. Aski is encoded to this
  12. 22. A round object
  13. 23. A shape that makes up a vector image
Down
  1. 1. Only one
  2. 3. Can it get biger?
  3. 5. You can adress it
  4. 6. Depth How many colours are in an image
  5. 8. How tall somthing is
  6. 9. Can it change ?
  7. 10. A four sided shape with two lines longer than the other
  8. 12. Somthing that describes an object
  9. 13. An outline of a shape
  10. 21. 000000