tutorial 3

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before

sometimes taking pictures in shadow can result in a blue-ish picture because of the change in the color-temperature of the light.

after

by curving the blue channel down, you can make the picture warmer. just make sure not to make it too yellow.

1. de-saturate

2. adjust curves

red channel:

green channel:

blue channel:
when you make the image warmer overall, it may appear to brighten. to avoid over-brightening the shadows, try pinning it down (A), and "adding yellow" only to the midtones and highlights (B).

all curves (RGB):
finally, add some contrast by applying an s-curve. keep an eye on your highlights (A) and avoid blowing them out if possible.

end