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RE: Color or black and white
Meaning, if you take a colored photo and just use saturation and lower it down, it becomes black and white.
But that not always produce the best results.
If you touched it or corrected it, you can explain how.
Just an idea for a guide.
No, I'm not just reducing saturation. Although this is one of the possible ways. I use the Lightroom program and there is a tool/button "shades of gray". The mathematical algorithm of this transformation is unknown to me. But in this version, I still have the opportunity to work with color channels and more subtly adjust the shades of gray that correspond to the color channels.
At the same time, if you want to return to the color option, then simply switch the processing mode to color.
Looks interesting.
Because of bad lighting in my apartment, I have to reduce saturation (to remove yellowish light) and increase contrast (both due to lighting and old phone camera).
You can try to change the white balance settings of the camera itself, reduce the color temperature.