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71846Re: q. about images without flats

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  • CurtisC
    Oct 1, 2012
      I'm about to leave and probably won't be back until after my talk, late tonight. There's a .fit in "Curtis in Anza" in files. The jpeg is in photos. Thanks, anyway.

      --- In ccd-newastro@yahoogroups.com, yahoo@... wrote:
      >
      > I don't see that folder.
      >
      > A JPG won't be of much help; I wanted to measure the brightness levels and for that, the .fit file is required.
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      > Ron Wodaski
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      > On Oct 1, 2012, at 10:52 AM, CurtisC <calypte@...> wrote:
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      > > JPEG in album "Curtis in Anza." There were no flat-fields applied. This is just one frame. Why are the corners light instead of dark? The image is on of my very first, from 2006. Other images that I took in the same period were similar (i.e., light corners). In those days I eliminated the unevenness in my final images by making the skies black.
      > >
      > > --- In ccd-newastro@yahoogroups.com, yahoo@ wrote:
      > >>
      > >> It would be helpful to see the image. Can you upload the .fit file to the files section of this group?
      > >>
      > >> Ron Wodaski
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      > >> On Oct 1, 2012, at 8:51 AM, CurtisC <calypte@> wrote:
      > >>
      > >>> I'm preparing a general talk about CCD imaging for our club. I dug up one of my very first images from several years ago to show an image without flats, to show their necessity. The corners, where illumination is weakest, are *lighter* than the center, opposite of what I would expect. Why? Is this an artifact of the original processing, which was with the contrast and lighter-darker settings in CCDOps?
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