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The Specular Render Element is an image that stores specular reflection (basically put, highlight) information calculated from the material's reflection value reflection value in the scene.  Specular Specular reflection is defined as the reflection of light from a surface in a single particular reflection, as opposed to a diffuse reflection, which is reflected at many angles.

The brighter the area, the more highlight reflection the object exhibits in the render. Specular highlights will be colored if If the Reflection Color parameter of a material is colored, the Specular highlights will be colored.

UI Path: ||V-Ray|| > Render Elements > Specular

(How to add a render element to a scene)

Enable Deep Output – Specifies whether to include this render element in deep images.

Color Mapping – Applies the color mapping options specified in the Color mappingMapping rollout of the V-Ray tab in the Render Settings window to this render element.

Consider for Aa – When enabled, anti-aliasing is used where possible.

Filtering –  Applies an image filter to this channel.

Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.

Vfb Color Corrections – – Applies the post-render color adjustments made from the VFB.

Denoise – Enables the render element's denoising, provided the Denoiser render element is present.