Process tab
     
    This tab is used to control the processing of the stacked image :
      
        - The "deconvolution" sliders control the deconvolution filter, 
          which "unblurs" your image.
 The "radius" slider controls the size of the "unblur", while the 
          "threshold" slider controls the strength of the filter (at 1 there 
          is no deconvolution at all).
- The "unsharp" sliders control the unsharp masking filter, which 
          enhance small scale details and levels the large scale brightness 
          variation (lunar terminator, jupiter "soft" edge...).
 The "radius" slider controls the threshold between large scale 
          contrast, which will be weakened and small scale contrast which will be 
          enhanced.
 The "gain" slider controls the amplification of small scale 
          contrast.
- The "levels" sliders simply controls the black and white levels.
      
When working on dark frames or flat fields, the deconvolution and
    unsharp mask are disabled. This tab is only used to visualize the
    stacked calibration image.
    When this tab is selected, the image frame displays the processed image, 
      and is updated to reflect any change.
	Use the menu "File->Save image..." to save your resulting image to a 16 
      bits RGB TIFF file.
	Preferences window ...