CELL driver resolution problem

[Malcolm Williamson]

Bill,
I believe that your seeing a pixel limit imposed by ps.map (1,000,000 pixels)
rather than the CELL driver. I think that Olga Waupotitsch fixed this in her
latest update of ps.map, found on the moon. Try that, and if you're still 
having problems, drop me a line and I'll send you a fixed version.

By the way, if you use a virtual window manager, such as tvtwm, you can define
a GRASS monitor of astronomical dimensions, enabling you to view these kinds
of raster files at full resolution without having to change regions.

> 
> If I set the GRASS_WIDTH and GRASS_HEIGHT environment variables to
> numbers (e.g., 2000 X 4000) that exceed the dimensions of my screen,
> I do not actually seem to get a higher resolution postscript file
> when I use ps.map to print D_cell.  This can be seen most clearly when
> displaying a legend with category names.  The sharpest postscript output
> comes from setting the environment variables at or near screen resolution.
> 
> For example, it appears that the CELL driver may take 2 rows of pixels
> displayed at screen resolution (e.g., 900 rows high) and spread them
> out over 4 rows in the resulting D_cell map if GRASS_HEIGHT is set to
> for example, 1800, filling in between the 2 rows with blank rows rather
> than interpolating.  The result is a fuzzier letter with GRASS_HEIGHT
> at 1800 than at 900.  Has anyone else noticed this?
> 
> This is not quite what I had hoped for from the CELL driver, as I think
> we want to be able to print each row of a 2700 row region on a 300 d.p.i.
> printer in 9" to take advantage of the higher resolution in the printer
> than we can get on our screens.
> 
> 	Bill Baker
> 	bakerwl at uwyo.edu
> 


-- 
Malcolm D. Williamson - Research Assistant       E-mail: malcolm at cast.uark.edu
Center for Advanced Spatial Technologies      Telephone: (501) 575-6159
Ozark Rm. 12                                        Fax: (501) 575-3846 
University of Arkansas              
Fayetteville, AR 72701