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| Nishkin |
07/11/2006 06:45PM (Read 3718 times)
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Status: offline
Registered: 06/28/2006
Posts: 5
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It's me again...When I try to use ccdmask to make a bad pixel mask with a division of flat field...I get the error "Invalid floating point operation"I had flat fields of 20s and 4s..I normalized them both with imsurfit and divided them with imarith (which I named Sflatdiv).When I run ccdmask on Sflatdiv..I get the error..Any help will be appreciated!Thanks!
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| fitz |
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07/11/2006 06:45PM
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Status: offline
Registered: 09/30/2005
Posts: 4040
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Without seeing the image and knowing particulars like the iraf/OS version it isn't really obvious what the problem is. FPE errors like this are usually data related, e.g. a zero pixel where the task wasn't expecting it, near-zero values in the denominator of a division, etc. Have you done an IMSTAT to see whether the pixel stats look reasonable? Does changing/unlearning some of the parameters change anything? If that doesn't help feel free to post a URL to the image and let me know what kind of system you're on. Frank may also chime in with suggestions if this sounds familiar to him as well.Cheers,
-Mike
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Ccdmask..bad pixel mask
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