Quote:
Originally Posted by Somnium
how do you read out the data in numbers rather than represented in light? can you use a tool to extract it to an excel spreadsheet or is there something that i am missing?
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You can do it easily in either PixInsight or Maxim DL (I personally prefer Maxim). In PI it is under Process > Image > Statistics. This brings up a window that will give you the average, STD and other stuff over the entire frame. The raw numbers.
If you subtract one bias frame from another the resulting image will have just the read noise (it is more accurate if you use a Master Bias). You do this with multiple bias frames just to calculate the average residual.
Craig Stark (wrote Nebulosity and PHD) has a lot of information on various aspects of astronomy.
http://www.stark-labs.com/craig/reso...s/CCD_SNR3.pdf
This goes quite deeply into doing the calculations but he does explain it pretty good.