  'Image' menu help page


  The 'Image' menu contains the following sub-menus:

  'Load':
      Load an image and/or the background emission from a FITS file.

  'Noise':
      Estimate the standard deviation of the noise in each pixel of
      the image. The noise array can also be load from a FITS file.

  'Bad Pixels':
      Load a bad pixels mask from a FITS file and replace bad pixels
      in the image. This task might be used to just read bad data
      points without replacing them.

  'Reference sources':
      Select reference stars in the currently displayed image by
      mouse click. The selected sources can be saved to a file and
      used for instance to compare different lists of stars (see the
      'Compare Lists' button).

  'Save':
      Save to a FITS file the following items:
      - processed image (e.g. after bad pixels repair)
      - background array (after PSF extraction or stars detection)
      - detected stars and synthetic stellar field
        (after stars detection)
      Save to an ASCII file the following item:
      - list of detected stars, with position, flux, formal errors
        and correlation coefficient. This operation may be done
        also before quitting the stars detection widget application
        (see 'Astrometry and Photometry' button in the main widget
        on-line help).
 
