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Re: Fractional Pixels Origin? [message #47548 is a reply to message #47547]

Thu, 16 February 2006 20:20

Greg Hennessy
Messages: 45
Registered: November 2005

Member

On 2006-02-17, David Fanning <davidf@dfanning.com> wrote:
> I thought Wayne was saying that the center of the first
> pixel was at [0,0], which would mean the pixel spanned
> the distance (on my ruler) of -0.5 to 0.5. JD seems to
> contradict this.

Well, Wayne is right in that FITS convention says [1,1] is the center
of the pixel. JD argues that saying [0.5,0.5] makes sense, and likens
it to a ruler.

It comes down to history. If you do arrays like Fortran, you say that
[1,1] is the center of the pixel. Fortran programmers say the new
millennium started in 2001.

C programers say the center of the pixel is [0.5,0.5], and that the
millennium started in 2000.

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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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