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Re: Fractional Pixels Origin? [message #47581 is a reply to message #47572]

Wed, 15 February 2006 13:31

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

"CJCrockett" <ccrockett@astro.umd.edu> wrote in message
news:1140036794.188403.185210@g14g2000cwa.googlegroups.com.. .
> 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?
>

As David said, this is a convention which is set outside of IDL, but seeing
that you have a "astro" E-mail address I'll say that the FITS convention is
that [0,0] locates the center of the pixel. (This differs from most other
image processing standards where [0.,0.] defines the lower lefthand corner.)

--Wayne Landsman

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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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