| Re: Color Printer limitations - Postscript resolution [message #2010 is a reply to message #2006] |
Fri, 13 May 1994 06:49   |
landers
Messages: 45
Registered: May 1993
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Member |
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I have also had problems with long color PS printing time (from PV-WAVE).
In my case, the plots are large color images. I discovered that I could
reduce the print time by reducing the resolution of the PS image. This did not
degrade my plots because of the nature of my data. I think that the
default PS image output is at around 300dpi, but this is just a guess. Reducing
this by 1/3 (to what I guess is 100 - close to what I see on my screen) makes the
files almost 1/9 the size, and reduces PS processing time accordingly.
You could do this by taking a 'snapshot' of the screen, but this 'pixelizes' any
text and lines in the plot, and can really get ugly if you resize it. I prefer to
do the re-scaling straight to the PS file from PV-WAVE.
To do this in PV-WAVE, I do:
scale = 3. ; the scale reduction factor
xsize = 6. ; the final x,y sizes of the plot (inches in this case)
ysize = 6.
SET_PLOT, 'PS'
DEVICE, /Color, Bits_Per_Pixel=8, Xsize=xsize/scale, Ysize=ysize/scale, $
/Inches, Scale_Factor=scale
!P.Charsize = 1./scale ; set character sizes - Scale_Factor doesn't affect them
< plot commands >
DEVICE, /Close
!P.Charsize = 1. ; reset it back to normal
SET_PLOT,'X' ; or whatever
Make sure that if you use Charsize keywords in your plot commands, to use them
relative to !P.Charsize or scale. Otherwise they'll turn out much too large.
Also, there is no !P.Symsize, so if you use plot symbols, you'll need to set
Symsize keywords relative to !P.Charsize, too.
Even if you want high resolution finals, you can use this for small, quick
previews.
I figured all this out by playing with DEVICE and PS and stuff. If I am going
about this the hard way, somebody let me know. There really ought to be a
Resolution keyword for the PS device to make this easier.
____________________________________________________________ _____
David Landers (214) 952-3910
M/S 8019
Texas Instruments landers@tsunami.dseg.ti.com
2501 W. University
McKinney, TX 75070
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