Creating punchy colour using the PS Channel Mixer
So here is a controlled way of pushing colour to your liking using an adjustment layer and the Channel Mixer.
Ensure your image has the correct white balance and tones before proceeding.
1. I like to always duplicate the background. (Ctrl+J - windows)
2. From the Layers pallet, go to the bottom choose the "Create new fill or adjustment layer" button and choose > Channel Mixer.
3. The Channel Mixer window opens on your red output channel, here you dial in +144% red; -20% green and blue.
4. Go to the green output channel dropdown and make Green +144% and red and blue -20%.
5. Go to the blue output channel dropdown and make your blue source channel +144% and the red and green source channels -20% each. Click on OK.
6. You now have a Channel Mixer layer added to your duplicate layer and here you can dial the opacity of the effect to your desired saturation level.
7. Flatten your Channel Mixer layer with the duplicated background layer (Ctrl+E Windows)
8. you now have the opportinity to further reduce the fill or opacity and the effect of your colour shift.
I find the effect on the colour tones to resemble Fujichrome Velvia film.
Just watch the effect on noise levels so less is more.
I also create a Action for this effect making it quick and easy and then I adjust the intensity of the effect manually.
So have some fun and boost those colours.
Photo credits: Mike Ehrman.
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