Re: Question regarding data reduction

On Sun, 30 Oct 2005 Mike Dworetsky <platinum198@xxxxxxxxxxxxxxxxxxxx> wrote:

> A bias offset is added before readout to all frames to avoid a situation in
> which very low data values might give negative numbers. To get the dark
> frame (= the thermal frame), or any other data frame such as flat field or
> raw-image, subtract the bias frame first. Then subtract the bias-subtracted
> dark from the bias-subtracted flat and bias-subtracted image. Then perform
> the flat field division process (usually by dividing the flat by its mean
> value first).

Hi Mike,

Thanks for that explanation. Cleared it all up for me!

--
Conor
As long as there are tests, there will be prayer in public schools.
.