| Function Graphics Questions [message #87179] |
Tue, 14 January 2014 09:56  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I have a New Year's resolution to learn more about function graphics
this year. I thought I would start with this multiple axis plot Chris
and Matt have been talking about this week. My idea was to produce
mirror of the Coyote Gallery plots, as much as I can.
I guess I've spent about three hours on this now and finally have this
one program in shape to be able to compare Coyote Graphics output with
the equivalent function graphics output. In doing so, I've run into some
questions. Perhaps someone knows the answers.
Question 1: I have no particular objection to the PostScript output
produced by function graphics commands, but is it true there is no
program control over things like the thickness of the PostScript lines?
Question 2: As far as I can tell, saving the contents of a function
graphics window as a PostScript file *always* creates encapsulated
PostScript files. Since encapsulated Postscript files (AFAIK) always
have to be in portrait mode, what is the purpose of the LANDSCAPE
keyword to the window save command?
In other words, this command:
window.save, 'test.ps', /Landscape
Produces exactly the same output, as far as I can tell, as this command:
window.save, 'test.ps'
Question 3: I haven't upgraded to IDL 8.3. Can someone tell me if the
bug in IDL 8.2.3 that prevents any line style except solid in PostScript
output is fixed. In other words, do these commands produce a Postscript
plot with a dashed line:
p = Plot(/test, LineStyle=2)
p.save, 'test.ps'
Question 4: Am I missing something obvious here. I mostly produce JPEG,
PNG, and TIFF output either for my web page of for e-mailing
intermediate results to colleagues. I like them to be reasonably small.
For my web page, for example, I like them to be no more than 600 pixels
wide. My usual way of creating such raster output is to run my code like
this:
cgPS_Open, 'test.png'
cgPlot, cgDemoData(1)
cgPS_Close, Width=600
The equivalent in function graphics is something like this:
p = Plot(cgDemoData(1))
p.save, 'test.png', width=600
But, this kind of output is very low resolution compared to what I've
come to expect.
I find the only way I can get high quality PNG files is to produce them
at full resolution, then resize them in the software I use for dealing
with raster images (Photoshop, Hypersnap, etc.). Since I have
ImageMagick hanging around, I find I can get what I want in IDL by doing
something like this:
p = Plot(cgDemoData(1))
p.save, 'test.png'
Spawn, 'convert test.png -resize 600 test_resized.png'
Is there a better way to do this?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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