Re: Bug in image code ?

[Ethan M. <merritt@u.washington.edu>]

On Thursday 18 August 2005 09:04 am, Daniel J Sebald wrote:
> 
> I think it can't, but let's continue to hash this out...  
> Image data sent to a plotting device, like a PostScript interpretter, 
> is a rectangular matrix--essentially a uniform sampling of intensity 
> (light, field strength, temperature, etc.).  
> There is no way to include in that data individual information about 
> a pixel, say, pixel 25 should be only 0.67 the size of the uniform 
> sampling interval.

Bad example.  PostScript support for explicit clipping is very straightforward.
You set the clipping boundary first, and then draw your big "pixels" without
any special processing.  PostScript itself will clip them to fit within the
requested clipping boundary.

The real problem comes from the drivers with external libraries that are
too stupid to clip -- libpdf being the prime offender.


-- 
Ethan A Merritt       merritt@u.washington.edu
Biomolecular Structure Center
Mailstop 357742
University of Washington, Seattle, WA 98195