Last month, I showed how to boost colour contrast using the Lab colour space. Now I want to stay within Lab, and look at a simple colour correction. The original image is a mix of flash and a rather warm background light, creating a mixed balance of light throughout the image as seen below.
Our first step is to change the colour space to Lab mode.
Within Lab there are 3 different channels, the luminance channel and 2 colour channels. The luminance channel doesn’t interest us today as we are just going to correct the colour balance rather than contrast. Looking at this image there is a red/magenta cast in the background, that can also be seen in the skin tones of the people. As channel A controls the red/green information, we need to adjust this channel in a curves adjustment layer.
Select a curves adjustment layer as shown above, then in the curves dialog box choose channel A and drag the curve towards the left.
dragging the curve to the left as seen above, changes the colour balance away from red and towards green. I have concentrated on correcting the colour cast in the background but this has left the foreground looking a little green and unappetising.
Using the curves layer mask we can reverse the colour correction for the foreground only. Click on the layer mask and paint with a black brush over the plate and the food to hide the effects of the curves adjustment layer.
The Original image and Final image are shown below, as you can see the plate and food are the original colour while the background is more appropriate.
This is just scratching the surface of the colour correction abilities of Lab mode and I recommend Dan Margulis’ book for further reading.
Please feel free to comment and ask any questions below
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