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Re: rough lines in IDL graphic window [message #46390 is a reply to message #46378]

Mon, 14 November 2005 14:40

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

The problem you describe is called aliasing, a common problem in
computer graphics:

http://en.wikipedia.org/wiki/Aliasing

Techniques for minimizing aliasing are called anti-aliasing:

http://en.wikipedia.org/wiki/Anti-aliasing

A simple approach to anti-aliasing is to to create a very large image,
say 4 times your desired size and then use REBIN or CONGRID to shrink
your image back to your desired size. I posted regarding this a while back:

http://tinyurl.com/8dxaq

The code at the bottom of that post could be integrated into your
program which dumps the images to disk.

-Rick

arctorit@yahoo.com wrote:
> Dear all,
> I have a 2D field of which I make contour lines. On the graphic window
> this contour lines
> appear quite rough, i.e. they seem to be formed by small rods one after
> the other.
> When I print this to a PS file, the lines become magically smooth and
> very nice to look at.
>
> Usually I don't care that much about this problem, but as now I would
> like to do a movie,
> starting from graphic window dumps, I would like to have the same
> smooth lines also
> in the graphic window.
>
> If someone can resolve this puzzle.................
>
> Thank you all.
> Franco.
>

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[Message index]

		Re: rough lines in IDL graphic window By: David Fanning on Tue, 15 November 2005 08:35
		Re: rough lines in IDL graphic window By: franco on Tue, 15 November 2005 04:20
		Re: rough lines in IDL graphic window By: Rick Towler on Mon, 14 November 2005 14:40
		Re: rough lines in IDL graphic window By: David Fanning on Mon, 14 November 2005 10:47

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