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Re: Fractional Pixels Origin? [message #47572 is a reply to message #47560]

Wed, 15 February 2006 14:28

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"CJCrockett" <ccrockett@astro.umd.edu> writes:

> A quick question. Does anyone know, definitively, what origin IDL uses
> when defining fractional pixels? Is (0.0,0.0) the center, bottom left,
> or other, of the pixel?

Greetings, fellow Terrapin! David is right, IDL treats graphics on
the *screen* as whole pixels.

The place where fractional pixels comes in is probably the
INTERPOLATE() routine. That routine definitely considers the place
where the pixel value is defined to be at the *lower left* corner of
the box.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Fractional Pixels Origin? By: David Fanning on Thu, 16 February 2006 21:15
		Re: Fractional Pixels Origin? By: Greg Hennessy on Thu, 16 February 2006 20:20
		Re: Fractional Pixels Origin? By: David Fanning on Thu, 16 February 2006 16:02
		Re: Fractional Pixels Origin? By: JD Smith on Thu, 16 February 2006 14:48
		Re: Fractional Pixels Origin? By: rm on Thu, 16 February 2006 06:24
		Re: Fractional Pixels Origin? By: Craig Markwardt on Wed, 15 February 2006 14:28
		Re: Fractional Pixels Origin? By: Wayne Landsman on Wed, 15 February 2006 13:31
		Re: Fractional Pixels Origin? By: David Fanning on Wed, 15 February 2006 13:03
		Re: Fractional Pixels Origin? By: JD Smith on Fri, 17 February 2006 13:25
		Re: Fractional Pixels Origin? By: mmiller3 on Fri, 17 February 2006 05:36
		Re: Fractional Pixels Origin? By: Greg Hennessy on Fri, 17 February 2006 05:06
		Re: Fractional Pixels Origin? By: Wayne Landsman on Thu, 16 February 2006 23:50

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