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| china_108 |
02/20/2009 04:16AM (Read 2802 times)
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Status: offline
Registered: 09/24/2008
Posts: 25
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I combined 10 dark images of 30 seconds. If the ccd images of my target have exposure times of 50 seconds or 80 seconds or whatever, when I subtract the dark from these images, iraf will subtract the dark of the original 30 seconds from them or iraf will create a dark of the same exposure time as the ccd images and then subtract it from them?
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| fitz |
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02/20/2009 04:16AM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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See the CCDPROC help pages, dark exposures and other calibration data are scaled so they have the same exposure time.-Mike
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| china_108 |
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02/20/2009 04:16AM
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Status: offline
Registered: 09/24/2008
Posts: 25
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sorry, I couldn't locate the ccdproc help pages. Is it in iraf or in this website?I tried https://iraf.net/faqman/index.php?op=cat&c=3 but couldn't find it.
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| fitz |
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02/20/2009 04:16AM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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To read the help page, type the task name into the banner bar above and hit <cr>, In this particular case, see https://iraf.net/faqman/index.php?op=cat&c=3
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about the exposure time of dark in ccdproc of ccdred
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