CELL driver resolution problem

[EA6945141 at v9001.ntu.ac.sg]

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>From: malcolm at cast.uark.edu (Malcolm Williamson)
>Subject:Re: CELL driver resolution problem
>Date: 13 Feb 94 16:22:39 GMT
>Message-ID:<9402131622.AA14566 at cast.uark.edu>

>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