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| massey |
05/21/2010 10:03PM (Read 1423 times)
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Status: offline
Registered: 02/10/2006
Posts: 162
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Hi, Frank et al---I'm in the process of measuring the Kitt Peak sky brightness (20 years and counting...) and I just want to make absolutely sure that I understand the number of pixels in my aperture using APSUM. I have an upper limit of +20 and a lower limit of -20. So, do I have 40 pixels or 41 pixels? (It makes a 2% difference in the derived surface brightness...) I would have guessed 41 but if I create an aperture that has an upper limit of 0 and a lower limit of 0 it contains no counts. Thanks.
---phil
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| fitz |
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05/21/2010 10:03PM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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Hi Phil, Frank is away this week but you might still get a reply. A quick look through the code doesn't reveal an obvious answer and I don't want to give you the wrong answer. If I figure it out I'll follow up but will defer to Frank for the expert advise.Cheers,
-Mike
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