Q S I 5 0 0 S E R I E S U S E R G U I D E
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Screenshot showing Pixel Math command ready to subtract a master dark frame.
Select your light frame for Image A at the top and your master dark for Image B. Select
me. If you took multiple images through different filters you will need to
create a master light frame for each color.
Scale by Flat Fields
Scaling dark subtracted images by flat fields follows a similar process to subtracting dark
frames.
“Subtract” for the operation. Click OK. You should see many of the bright pixels scattered
around the light frame, disappear or get visibly darker. Do this with each of your light
frames. After dark subtracting the individual light frames, the light frames can be combined
into a master light fra
Note:
Taking proper flat fields can be tricky. If the flat fields aren’t exposed
and processed properly, scaling an image by an improper flat field can produce
worse results than not calibrating with flat fields at all. Experiment and practice
for the best results.