Here’s a nice little trick I learned to improve the contrast and saturation of images in Photoshop, without having to spend too much time messing around with levels or curves:
- Open the original image
- Create a duplicate layer (hit command-J on a Mac)
- Right click on the new layer, in the layers tab
- Select ‘blending options’
- Under ‘blend mode’ choose ‘soft light’
The effect can be weakened or strengthened by adjusting the opacity of the layer. If you want to push it beyond 100%, just make another copy of the original layer and blend it in as above.
With portraits, this trick can make people look a bit red. If so, adjust the hue and saturation by selecting Adjustments >> Hue/Saturation. Then, edit ‘Reds’ by dragging the slider over a bit to include oranges, then reduce the level of saturation.
A video explanation of all this is online.
Digital retouching
Physical implausibility
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photoretouching