| image manipulation to postscript [message #7908] |
Mon, 27 January 1997 00:00 |
Runar Joergensen
Messages: 3
Registered: September 1996
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Junior Member |
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My application is designed, by request, to manipulate data displayed as
images. Manipulation is done with the tools Xloadct, and Xpalette.
And then the manipulated image is "saved" in a selected format and
then printed on request. Works splendid if you want to save it as TIFF,
GIF or JPEG.=20
But with postscript there is a problem with the quality of the rendering.
What I tried to do was to read of the display area with tvrd() (check code
sample below), to be sure I got the manipulated image. But the result
compared to printing the original data array as postscript was worse than
I'd hope for. My guess is that it's effect of reading of the display
buffer. Letters get "edgy". Background is black. Contrast is high. Not
very much comparable to a direct postscript rendering of an array.=20
Is there away to get a postscript rendering of the manipulatied array
without the use of tvrd() first?
(Here the code I use for the rendering of postscript?)
First some stuff from the event handler.
'File.Save.PostScript': BEGIN
outfile =3D "FFT.ps"
mess =3D 'Writing file: ' + string(outfile)
widget_control,info_text, set_value =3D mess
; plt=3Dtvrd() ; This gives bad results.
plt=3Dspect
display, plt,factor, 'ps', outfile
endif else begin
This is the relevant part of the display procedure. It's not very
intelligent, but it works.
if (dev EQ 'ps') then BEGIN=20
set_plot,'ps'
device,filename =3D ofile,/landscape
contour,specter,tal_sec,y,$
/nodata,/noerase,$
xstyle=3D1,ystyle=3D1
tvscl,specter,!x.window(0),!y.window(0), $
xsize=3D!x.window(1)-!x.window(0), $
ysize=3D!y.window(1)-!y.window(0), /norm
endif else begin
Many thanks,
Runar J=F8rgensen
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Runar Jorgensen ||=20
University of Oslo || Phone: +47 2285 5664 =20
Department of Physics || Telefax: +47 2285 5671 =20
P.O.Box 1048 Blindern || email: runar.jorgensen@fys.uio.no
0313 Oslo; Norway ||
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=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- =3D-=3D-=3D-=3D=
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