LAB Saturation Layer

LAB Saturation Layer

LAB Saturation Layer

LAB Saturation Layer Article by Brian Knott. If you would like to write for us, please read here.

Today we take a look at adding a LAB saturation layer to our images. There is a saturation slider built into photoshop but instead, I will be using an alternative method that gives me more control and better results than the saturation slider.

The problem with the saturation slider is that it can affect the brightness of color tones. It can also add noise. By using a LAB layer we have more control. We can avoid the side effects of the standard saturation slider.

LAB Saturation Layer Before

Original file before saturation adjustments.


How To Apply a LAB Saturation Layer 

1. Duplicate the image via the top menu Image>Duplicate. In the dialogue box select Duplicate Merged Layers Only if you had multiple layers. Click OK.

Duplicate layer

2. Change the color mode to LAB by going to Image>Mode>LAB Color.

lab colour mode

3. Duplicate the background layer by using Ctrl+J (Cmnd+J in Mac) or in the menu by selecting Layer>Duplicate Layer.

4. Change the blending mode of this new layer from Normal to Overlay. Using the drop-down menu at the top of the layers panel. The effect will have overly exaggerated contrast now but we’re not done.

blend mode colour overlay

5. We now need to open up the Blending Options dialogue by double clicking the duplicated layer or right clicking the layer and selecting Blending Options. Under Advanced Blending you will find channels L, A and B checked off. Uncheck the L channel and click OK and see the saturation effect.

layer style lab

If you like the overall results skip to Step 7. But if the saturation needs tweaking go to the next step.

LAB Saturation layer

In this example, there are areas where the pink clouds are so oversaturated that they are losing detail so I will make some adjustments.

 

6. If any particular color channel is oversaturated, we can adjust them individually to balance out our saturation needs.

Lab layer style

  • Go into Blending Options. First, in the drop-down menu in Blend If, you’ll need to select channel A and/or B to make each adjustment.
  • Channel A is Cyan/Magenta, Channel B is Blue/Yellow. For example, if you want to desaturate the blues then select the B channel.
  • Use the This Layer slider to make the adjustments.
  • Hold down Ctrl and Alt (Cmnd and Opt in Mac) and drag the slider from the blue over towards the yellow until you are satisfied (you can watch the effect in real-time on the image).
  • Similarly, if you need to desaturate the magentas then, again holding down Ctrl and Alt (Cmnd and Opt in Mac), drag the magenta slider towards the cyan side in channel A.

colour saturation

Here is the result of dropping down the magenta tones. You can now see the clouds are still a nice pink but we have restored the detail in them.

reduced lab saturation

 I wanted to keep the magenta saturation in the mountains though so I painted out that area with a black mask.

 

6a. Furthermore, if you want to completely desaturate one color but keep the rest of the channels saturated.

Drag the end of that slider to the middle until it reads 128, this time without holding down CTRL and ALT (this will render the saturation for that color to zero while leaving the others untouched).

6b. On the contrary, if any color is still lacking in saturation, you can just duplicate the saturation layer and the effect will be doubled.

Each layer can be duplicated as many times as you need (each duplication amplifying the previous effect). Once you get a good baseline saturation on whatever color was lacking, you can repeat the action above of desaturating other color channels if they have over saturated with the duplicated saturation layers.

7. When our adjustments are done, simply flatten the image by right clicking a layer and selecting Flatten Image.

Now hold down shift and drag this saturated duplicated image onto the original file or use Ctrl+A (Cmnd+A) and then Ctrl+C (Cmnd+C) to copy the image and then use Ctrl+V (Cmnd+V) on the original file to paste it as a new layer. This will put your saturation layer on top of any original layers you might have had. Adjust opacity as desired. Rename the layer appropriately.

If you need to make any further adjustments to your image you can either add new layers above the saturation layer or you can change the blending mode of the saturation layer to Color and you can now adjust any layer beneath and the results will be visible.

LAB Saturation Layer Before

reduced lab saturation layer


Here’s Another Example

Let us show you another example where a LAB Saturation Layer has been applied.

 

Lab Color saturation

LAB color saturation

I think you’ll find that the blues are too saturated and not very natural looking. 

To resolve this oversaturation, I opened up the Blending Options again and, while holding Ctrl + Alt (Cmnd + Opt), I dragged the cyan slider towards magenta and the blue slider towards yellow until it looked more natural and gave us a balanced LAB Saturation Layer

Lab saturation before

LAB Saturation after

Here is the final result that I am happy with.



Additional Resources

This tutorial was written by Brian Knott. Website | Facebook


Online Resources

This is Brians second article for us. Here you can read his first article A Hidden Way To Add Precision Contrast To Your Photos.

To find out more about LAB I found this post which explains What Is Lab Color Space? (And How to Use It in Photoshop)

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