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Thread: Image color accuracy

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    Default Image color accuracy



    Getting started in astrophotography. Trying to my puddin' head wrapped around the what to do and why
    I'm doing it.

    One thing that I wonder about. When I get done doing all the playing and have a picture that I find
    pleasing, how do I know that what I have is what the object actually looks like? If I could get to
    location where the object would fill half of my "sky" would it look the same as my finished picture.

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    Default Re: Image color accuracy

    You are not going to see colour no matter how close you get. For example, we are right in the middle of a large, bright spiral galaxy. How much colour do you see?
    The point is that if you go halfway to an object (say the Trifid Nebula) its total brightness increases by a factor of 4, but so does its surface area, so its surface brightness doesn’t change. Even if you get right into the middle of it you will be in a much better vacuum than we can ever make on earth. Not much of anything to be seen, let alone colour.

    The problem is that our eyes can’t detect colour at low light levels. Doesn’t mean the colour is not real. Go outside on a dark night: everything looks grey, but if you do a 30 second exposure with a DSLR you’ll see the colour.
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    Default Re: Image color accuracy

    This is a good reason why a hbeta filter and oiii is a good choice for visual observing because our eyes are less sensitive in the red spectrum and are better of towards green,i think some people have reported on a large mirror 18"-20"with good skys that they can see a very tiny amount of light pink and blue tinge on bright nebula's,

    all i can see is grey and a tinge of green through my 10'' dob

    I would say that a dslr/ processing software does colour balance very well to what we would see if we could get enough photons down our eyes

    from wikipedia

    Last edited by yobbo89; 02-10-2019 at 06:15 AM.
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