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Introduction

  • Photoshop Colour Lookup Tables (3D LUTs) are single click, non-destructive, colour adjustment layers which you can create and save. They are the sum of any number of adjustment layers all added together and saved as one effect, which makes it a very convenient way of saving particular colour toning looks.

Adding a Colour Lookup Table

  1. On the layers panel click the Add Adjustment Layer icon and select Gradient Map. Alternatively add this from the Menu bar as Layer > New Adjustment Layer > Colour Lookup Table.
  2. This creates a Colour Lookup Table icon.
  3. A white mask is created at the same time, which is linked and shows all the content.
  • Adjust the Opacity and Fill to control the intensity of the effect and different blend modes to effect the look.
     
Adding a Colour Lookup Table

The Properties Panel

  • Open the Properties Panel and check that the Colour Lookup Table icon (1) is selected. This gives you several options -
  1. Colour Lookup Table icon. Click on the other icon for the mask properties.
  2. Select the file type. The 3DLUT File has the most examples. Device Link has effects pulled from your computer's settings.
  3. Click on the drop down list to view the list of available LUTs.
  4. Create a clipping mask to the layer below.
  5. Press to view previous state. Can also use \ instead.
  6. Reset to adjustment defaults.
  7. Toggle layer visibility.
  8. Delete this adjustment layer.
  • Dither is used where there is banding of the gradient and it adds some noise to even this out.
Colour Lookup Table Properties

Using Colour Lookup Tables

  • Photoshop comes with a number of LUTs already loaded, which you can access from the Properties Panel as shown above. However, the only way to use them is to click on the LUT and apply it as there is no preview. This is not very convenient.
  • This can be overcome by looking at Introduction to Photoshop Lookup Tables by Matt K. This article has a video and contains a link to the free download of his Layer Comps file where you can add your image to this Photoshop file, merge it down with his background image and then play the whole series of LUTs by pressing the arrow keys. This is by far the easiest way of visualising these effects.
  • Tone down the effect of a LUT by reducing the layer opacity, altering the blend mode, using Blend If or using masks, such as a Luminosity Mask.

Creating and Saving Your Own LUTs

  • You can create and save your own LUTs. These will be a series of Adjustment Layers, which can include other LUTs but can include any type of adjustment layer.
  • To save your own LUT you must only have the adjustment layers you want to save and the background layer selected when you do this. Then go to File > Export > Colour Lookup Tables ... . This file can be brought back into any other document from the LUT Propertied Panel in the 3D LUT File menu, using the top option of Load 3D LUT. (Ref 4:15).
  • f64 Academy groups all the adjustment layers into a group, selects the group, then exports. Save as a Quality of 64 Grid Points (High). Format as ICC Profile for maximum compatibility. He also discussed where to store your saved files, which isn't as easy as it should be. (Ref 5:35).
  • There is now a better way to save your LUTs using Adobe Creative Cloud Libraries which store all the adjustment layers as a smart object which can be brought back from the library in an editable form, so that you can fine tune adjustments for a new image. (See A Better Way to Store Colour Lookup Tables).

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