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Hold-And-Modify

Fragment of full-color image (left) vs Amiga HAM (right)

Hold-And-Modify,[1][2][3] usually abbreviated as HAM,[4] is a display mode of the Commodore Amiga computer.[5] It uses a highly unusual technique to express the color of pixels, allowing many more colors to appear on screen than would otherwise be possible. HAM mode was commonly used to display digitized photographs or video frames,[6] bitmap art and occasionally animation. At the time of the Amiga's launch in 1985, this near-photorealistic display was unprecedented for a home computer and it was widely used to demonstrate the Amiga's graphical capability.[7] However, HAM has significant technical limitations which prevent it from being used as a general purpose display mode.

  1. ^ Office, United States Patent and Trademark (1997). Official Gazette of the United States Patent and Trademark Office: Patents. U.S. Department of Commerce, Patent and Trademark Office.
  2. ^ Cite error: The named reference amiga_hardware_ref was invoked but never defined (see the help page).
  3. ^ Mortimore, Eugene P. (1986). Amiga Programmer's Handbook. SYBEX. ISBN 978-0-89588-343-8.
  4. ^ Pokorny, Cornel K.; Gerald, Curtis F. (1989). Computer Graphics: The Principles Behind the Art and Science. Franklin, Beedle & Associates. ISBN 978-0-938661-08-5.
  5. ^ Maher, Jimmy (January 26, 2018). The Future Was Here: The Commodore Amiga. MIT Press. ISBN 9780262535694 – via Google Books.
  6. ^ Mace, Scott (July 28, 1986). "Digitizer Allows Users To Alter Amiga Images". InfoWorld. p. 10.
  7. ^ Cite error: The named reference :0 was invoked but never defined (see the help page).

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