[Tig] semantics: definition vs. resolution

[Bob Friesenhahn]

On Sat, 5 May 2007, Kevin  Shaw wrote:
>
> I also maintain that we spend a bit too much time worrying about pixel
> resolution and not enough on bit depth, but that would be another topic...

There are many important motion image properties:

  o color gammut (available color range)
  o dynamic range (intensity range between black and white)
  o spatial resolution (horizontal/vertical resolution)
  o temporal resolution (sample updates per time unit)
  o sample resolution (number of bits in a sample)
  o background noise level

but in the end, if a crappy compression algorithm is involved, then 
the other properties may not matter at all.  We have all seen 
excellent SDTV images (e.g. good DVD) and terrible SDTV images 
(massively compressed satellite image).  The good SDTV image and the 
lousy SDTV image had the same abilities at their disposal but the 
lousy image was severely damaged by excessive compression and has 
little "definition" left at all.

Bob
======================================
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/