ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

154 CHAPTER 14. IMAGE ANALYSIS AND DISPLAY
CIA> ps_open, /portrait, /color, /encapsulated
Any plotting routine that does not specify a window can be used to direct output to idl.ps.
CIA> contour, raster_pds.raster
The following call to ps print will rename idl.ps to raster.ps and print it to a printer named
e15 – deleting the old file in the process.
CIA> ps_print, ’raster’, /delete, printer=’e15’
14.8.1 Avoiding postscript problems
In this section we will address some problems which are commonly experienced when printing
to IDL the postscript device.
• Because postscript device pixels are scalable, any output graphics will expand to fill the
entire postscript device area. This means that a square image on your screen could end
up as a rectangle in your postscript file.
• Modifying the colour table (by using XLOADCT for example) can mess up the IDL’s
internal colour table. This can give unexpected results when you output colour graphics
to the postscript device.
The above problems can be avoided by following the procedure in the example below.
1. Create a new window by calling WINDOW with keyword retain set to 2.
CIA> window, 1, retain=2
2. Display your image.
CIA> tviso, image
Modify the colour table (with XLOADCT) asyoudesire.
3. Save the displayed image using TVRD.
CIA> image_get = tvrd(1)
4. Now open the postscript device
CIA> set_plot, ’PS’
Determine the graphic size.
CIA> ss = size( image_get )
CIA> x = ss[1]
CIA> y = ss[2]