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Re: Fractional Pixels Origin? [message #47560 is a reply to message #47550]

Thu, 16 February 2006 06:24

rm
Messages: 4
Registered: June 2005

Junior Member

How's about this

pro find_pixel_edge

window, xsize=20, ysize=20
count=intarr(1001)
for i=0, 1000 do begin
plots, [0.0, 0.01*i], [10,10], /device
bits=tvrd()
count(i)=total(bits ne 0)
endfor

print, where(count ne count(1:*))*0.01

end

I've tried on a couple of Linux platforms and versions of IDL and the
result I get is

0.490000 1.49000 2.49000 3.49000 4.49000
5.49000
6.49000 7.49000 8.49000 9.49000

So a new pixel starts at 0.5, 1.5 etc. which makes [0,0] the centre of
a pixel.

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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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