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Creates a layer. Multiple layers of the same type can be added.

Folder - Allows grouping multiple layers in folders. This is only available when the Source layer is set to Composite;
Background – Adds a background Vignette – Adds a vignetting effect to the image.
ICC Profile – The ICC correction allows you to apply an ICC profile to the image, so that (for example) it matches the appearance of the image in Adobe PhotoShop. 
Filmic Tonemap – Contains different types of mapping curves and gamma corrections. Also allows selection of a color space.
Lookup Table - Allows loading a LUT file for color transformations;
Curves – Adds a Curves color correction layer;
Color Balance - Adds a Color Balance color correction layer;
Hue/Saturation - Adds a Hue/Saturation color correction layer;
White Balance - Adds a White Balance color correction layer;
Render element - Selects a render element from your image that you can use in compositing. This is only available when the Source layer is set to CompositeExposure - Adds an Exposure color correction layer;
Constant - Adds a solid color that can be used to achieve an effect on another layer (for example to multiply by the constant);
Exposure - Adds an Exposure color correction layer;
White Balance - Adds a White Balance color correction layer;
Hue/Saturation - Adds a Hue/Saturation color correction layer;
Color Balance - Adds a Color Balance color correction layer;
Curves – Adds a Curves color correction layer;
Lookup Table - Allows loading a LUT file for color transformations;
Filmic Tonemap – Contains different types of mapping curves and gamma corrections. Also allows selection of a color space.
Integer mask elementRender element - Selects a render element from your image that you can use in compositing. This is only available when the Source layer is set to Composite;
Background – Adds a background color correction layer;
Integer mask – Mask is used with integer render elements like VRayRenderID, VRayObjectID, and VRayMtlID Render Elements.
MultiMatte mask element – Mask is based on the MultiMatte Render Element.
Image alpha mask – The Image Alpha Mask is based on the rendered Alpha channel.
Cryptomatte mask element – –  Mask is based on the VRayCryptyomatte Render Element.
Proportion Guide – Adds a grid proportion guide layer.

Quick access to custom layer presets. You must set the path to it in the VFB Settings.