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i quote from a text book "aip 4 win"
Ideally the raw flat exposure should fill the charge wells in the ccd photosites to roughly 1/2 of their full depth, enough to produce a strong signal but not so close to saturation that the ccds response to light becomes non linear.
to make a master flat feild frame of extremely high quality , shoot at least 16 raw flat field frames and 16 flat darks . to make the master average the flats average the flat darks , then subtract the averaged flat dark from the average flat field..........................
i know ... so you want to know what a flat dark is.....thats the dark frame plus bias for the flat exposure ... confused .... yeah it gets all technical 580 pages of it
for you blue frames just turn them into greyscale ???
happy picture taking
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