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Fig. 39
During day, the dark frame correction is not performed, because negligible dark level.
If no file cannot be found inside this “DarkFrames” folder, if the image file does not have the same size in
width or height, or if not the same pixels type, a message error will be displayed in the status tab of the
control panel.
This dark frame subtraction is performed through an optimization algorithm of the coefficient to be applied
to the master dark frame image. If many files are present, the software will select the master dark frame
that provides a result that is closest to 1.0.
Fig. 40
The software scans the presence of files in the DarkFrames folder and will automatically pick up the most
appropriate file.
This means that if the master dark frame was produced at a given temperature, a given exposure time and a
given gain, the software is able to optimize the subtraction of the current image by the best dark frame,
even if there was temperature changes. This is performed within a reasonable range of variation. It will be
discussed later on the effects and validity of the dark master frame according to the variation of parameters.
As there are still hot pixels that have non-linear behavior and cannot be corrected by the dark master frame,
correction using hot pixels list can be achieved, cleaning the image of hot pixels by its neighbors.
Just check the box highlighted in the screenshot below.
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