Quote:
Originally Posted by EzyStyles
Hi Rich. Thanks for the G2V calibration info. I was wondering not all stars are white though and how will that change the final image? theres heaps of reading from the link you gave me will definitely give it a go once i totally understand what it is all about lol 
cheers mate. |
Eric, the reasoning behind doing a calibration to a star with exactly the same spectrum as our own Sun a G2V type... is so that we can see the night skies colours as they could be seen if our eyes were super night sensitive, but in reality, we're using CCD's or cmos detectors that all way different from each other, then there's the scopes we use all different.
Our own G2V star makes the colours as how we see them.
So when you find the correct rgb ratio from a G2V star, thus giving you essentially a white star,(=amount of rgb =white) then for example stars that are red giants or new blue stars will appear in their correct spectrum instead of some weird colour. Your nebulas will display a correct colouration showing their subtle transitions and all the other objects will be calibrated as to their light spectrum.
You won't have to compare your images with any one else's on the net, as I guess many people do then adjust to these variations which sometimes appear wrong.
Like Mike said, many make the mistake of looking at the old emoltion images with red sensitive film.... these images looked all red..... and cranking the saturation up in red...
Any way Eric, read the write up on G2V stars, you'll see what I mean.
All the best
Rich