Hi guys, I have a QHY8 camera. I've read posts on this forums about color balance and how we know we have the right colors in our DSO when doing RGB composite. I also heard about shooting a white and grey card in broad daylight to calibrate the camera colors. How does this work? What am I looking for in the shot? I don't understand the concept. Any help/tips would be much appreciated. Thanks heaps.
You dont know what the exact colours are of DSO's. Every persons processing and exposures dictate the final colour image.
I just adjust the colour balance until it looks like it should. Others may use tools or specific tests to get closer, so maybe someone else may comment.
You dont know what the exact colours are of DSO's. Every persons processing and exposures dictate the final colour image.
I just adjust the colour balance until it looks like it should. Others may use tools or specific tests to get closer, so maybe someone else may comment.
Theo
Hi Theo, that's what I'm trying to avoid. Because when you think about it, every DSO is going to end up with a different color calibration if it's based on a "pleasing" colour. I'm trying to work out a consistent base to start from. I heard people shoot a G2V star and calibrate like this. Other shoot a grey and white card in daylight. I need to find a quantitative way to work out the basic R G & B ratios for my QHY8. Then when I shoot in the dark I can have "correct colors" to start with. I don't know. Should I shoot a know subject in broad daylight on 1ms then have a look at the colors and match the ratios this way?
I'd recommend going for the G2V star method.
There are plenty of catalogues of these stars available; just make the colour balance adjustments until you achieve a "white" star image.
These settings will give you a "baseline" for your camera and you can always re-check/ validate by comparing G2V stars in later exposures.
What am I looking for in the shot? I don't understand the concept. Any help/tips would be much appreciated. Thanks heaps.
