Quote:
Originally Posted by Terry B
Altering the light level only changes the display not the actual data.
Note. Dark subtraction only works with raw or fits files. JPEG files have been compressed at the individual pixel level and this prevents the darks from subtracting the actual pixels affected.
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I'v been using adjusting RAW files prior to using them in DSS, I then use 16 bit TIFF files which I learn't does not alter the pixel base while it also provides the ability to adjust colour in DSS. When using RAW my final images alway come out Monochrome no matter how much saturation I use.
It would seem that the by adjusting the Lights to get more star that are present in the picture also bring ups the camera noise as well, I would also assume that darks would have the same thing and would need to subtract at the same level otherwise there would be a dis-proportionate SNR in the image. I have the same issue with Audio SNR as with IMAGE SNR.