# 10 Feb, 2020 17:47
Dear moon guys.|
I've been wondering for a long time what the best way in the image processing is to get the best black and white result. You have to know that I am using a ZWO ASI color camera. When is the best time in the editing process to convert an image into black and white? Before stacking or before sharpening and denoising. Is it better to edit the color channels completely separately and only merge them at the end? I don’t have any idea.
I am looking forward to your feedback.
Thank you in advance.
# 11 Feb, 2020 11:46
Having been in a similar situation with my ASI120MC-S color camera, I attached an IR-pass filter to the color camera and set white balance values WB_R and WB_B to 50 (no white balance). During processing in PS, I converted the image to grayscale as the first step because only then can best monitor what is happening to the grayscale image when you apply processing steps. There may be a wiser way for processing, but it worked for me.
This method does not match a mono camera for sensitivity while the IR-pass filter drops the camera's relative response down to some 50%. The shorter the IR pass wavelength the less loss in permeability. I think the Astronomik Pro-Planet IR742 is the best compromise between permeability and the filter's main purpose, namely oppression of poor seeing. My ZWO IR850 passes at 850mn and above. It is highly effective but way too 'dark'.
I have posted a graph on my website:
Please expect further replies before you purchase anything :-)
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