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V-Ray Output texture can be used to perform various adjustments to a texture's value, such as multiplication, offset, inversion and clamping. 

UI path: ||mat Network|| > V-Ray > Texture: Utility > V-Ray Output

Texture – Specifies the texture map.

Bump Amount – Specifies the bump amount if the texture is used for bump mapping. 

Clamp Output – Clamps the output in a [0.0;1.0] range.

Default Color – Specifies the color when there are no valid UVW coordinates.

Mult – Specifies a strength multiplier for the texture color.

Offset – Color corrects the texture by adding the RGB color values specified here to the RGB color values in the texture.

Invert – When enabled, inverts the resulting texture color.

Source – Specifies where the alpha channel is drawn from.

Alpha – Alpha channel is drawn from the texture.
Color – Alpha is generated from pixel intensity.
Opaque – Alpha channel is fully opaque.

Use – Differentiates between textures exported from different applications. You can choose between Color Intensity (3ds Max) and Color Luminance (Maya).

Mult – Specifies a multiplier for the texture alpha.

Offset – Specifies an additional offset for the texture alpha.

Invert – When enabled and Invert from Color Tweaks is also on, the resulting texture alpha is inverted as well.