Re: [Gimp-print-devel] Latest results

[Robert L K. <rl...@al...>]

   Date: Thu, 18 May 2000 16:26:33 +0200
   From: Thomas Tonino <tt...@bi...>

   The second is that I'm generting a new matrix now. It has somewhat
   reduced noise, but more interesting may be the change in selected
   initial points. The current matrix has starting points selected for
   minimum autocorrelation when shifted 1/2 H or V, the new matrix will
   shoot for 1/3 or 2/3 H and V. This gives 9 uses for a single matrix:
   enough for cCmMyYkK and yet another independent use.

That sounds very interesting.  I count two uses per color, or 8 total
(Cc are treated as one color).

   Robert, do you think 199 x 199 is big enough for a release version or
   would you prefer 251 x 251 or 257 x 257 ? That would make full of the 16
   bits internal resolution at least.

257x257 would be pretty much ideal, although there would be slight
excess resolution.

   In any case, the approximated version (which is much like the original)
   is delayed and blurred (by diffusing into other cells) as it is
   subtracted from the input. And what happens if a blurred version of X is
   subtracted from the original X: X is sharpened by making the low
   frequency components weaker. The process is also called 'unsharp mask'.

I think I get it.  This is why there's a blank area near a sharp edge
in some cases.

-- 
Robert Krawitz <rl...@al...>      http://www.tiac.net/users/rlk/

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lp...@uu...
Project lead for The Gimp Print --  http://gimp-print.sourceforge.net

"Linux doesn't dictate how I work, I dictate how Linux works."
--Eric Crampton