Photoshop layer affects - Color, Overlay, or Multiply?
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This is a mad topic because there are so many options/techniques. A lot of the responses covered most areas.
Common techniques I would use are adjustment layers check colorise, move the hue slider down to a bluish hue if for instance it's outdoors and you want bluish shadows move the value slider down to darken it and drop the saturation slightly and your whole piece will have a dark bluish hue to it, then I invert the mask and it disappears then I paint in my shadows in the adjustment layer mask and I usually drop the opacity on that layer, no blend mode though. I could do about 3 of these at varying levels of opacity to build up shadows.
For lights (let's say sun) I add adjustment layer check colorise, move the hue slider to yellowish hue and pull the value way up toward white and boost the saturation so your piece looks blown out, drop the opacity to around 70 turn blend mode to overlay of soft light invert the mask on the adjustment layer and paint into the mask.
This technique means youd just painting in masks using black and white. I like this way even just to get going.
Hope that helps a bit
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@Phil-Cullen One thing I've noticed though is that "Colorize" style seems to work differently based on the program. Sketchbook, Photoshop and Procreate I know for certain differ wildly on how colorize interacts with the colors. Oddly, it works really well for Sketchbook in my opinion, but the other two just make the colors not reliable (at least on the two platforms I'm running on).