What is the best way to change the colours in a photo to a specific colour?
Specifically, how can we change the colours using Curves or Levels Layer? Here are few examples for understanding:
- orange skin tone to pink
- green leaves to yellow
- blue sky to cyan
- black road to violet/dark blue
I mean what values of R, G and B will bring other colors like cyan, yellow, pink, brown etc.
Also, can you suggest the best methods for such colour grading?
Answer
RGB is fine for minor changes such as going from blue to cyan, but if you want to make major changes you should learn how to work in LAB. LAB's separation of color from luminosity into two distinct opposing channels makes it easy to change one color into any other color using a combination of channel blending and curves. For example, I was able to change bright green grass into a bright yellow in two quick steps (and I've never even tried something like this before!). When I tried to do it using hue/saturation, I had problems with the color range selector not getting everything and with some parts turning red. I spent more time getting a worse result. LAB can certainly be intimidating, but it's power makes it worth learning how to use.
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