# 22 Jan, 2017 00:39
Hey all, I've been working on an f/6 Orion set, meaning that I can get M43 and only most of M42 in frame - and as a result of the exposure times, the entire image has visible banding of nebulosity.|
Ive been using the color sampler tool in Photoshop to keep track of color in parts of the image, but I am somewhat limited in maintaining the background color. The closest method I've found is to sample the darkest parts of the nebulosity, but I know there's still interstellar medium there because it appears when the curves are severely stretched.
I can see some color changes image-wide but the sampler has the advantage of seeing any single change in RGB for 256 values, which is finer than I could consciously notice. Are there other methods of finding the black / neutral point? Is there way to sample an entirely different image and then apply that white balance to the Orion image?
# 23 Jan, 2017 15:39
I usually use a 32x32 or 51x51 average pixel sample (on a known white or black area) and use Photoshop > Image > Adjustments > Color Balance > Shadows (black) or Highlights (white).|
I also use…
1. Photoshop > DeepSkyColors > WhiteCal
2. Pixinsight > ColorCalibration
#2 may give you the best control, but the others work well too.
# 23 Jan, 2017 22:46
|Had not heard of that PS plugin before - it will take some tweaking but it gives me promising results. I also had not thought of simply using a larger sample size, that will probably be simplest.|
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