Emboss Node
The Emboss node embosses the primary (top) image input with a bumpmap (bottom input), in effect raising in relief certain graphic elements of the primary image. A bumpmap is a pseudo-3D image that contains a perturbation of the surface normal for each pixel.
The Emboss nodes takes two inputs:
- The primary image can have any number of 8-bit, 16-bit, or floating point channels.
- The bumpmap input must be a two-channel floating point image such as that created by the Bump or Surface Normal node.
Emboss Parameter Tab
Emboss Scale
The Emboss scale parameter controls the depth of the embossing. As you increase or decrease this value, the Emboss node lengthens or shortens the vectors of the bumpmap within the following range:
- 1 = maximum embossing
- 0 = no embossing
- -1 = maximum negative embossing
Light Direction
The Light Direction parameter provides you with two ways of controlling the lighting direction in three dimensions around the image:
- can key specific x,y,z coordinates into the three Light Direction boxes.
- can use the Gaffer's tool icon to control the light source. Click and drag the tool to "move" the light source. The x,y,z coordinates in the Light Direction boxes will update accordingly.
- Tip:
- You can create a negative emboss effect simply by changing the lighting direction (without adjusting the Emboss scale parameter).
Ambient
The Ambient parameter controls the non-directional or surrounding illumination. You set this parameter by keying in a numerical value or by using the mouse to set the tuner to the desired value within the range of 0 to 1.
Diffuse
The Diffuse parameter controls the level of reflected light. You set this parameter by keying in a numerical value or by using the mouse to set the tuner to the desired value within the range of 0 to 3.
Specular
The Specular parameter controls bright highlights from shiny surfaces, such as brilliant reflections on metallic objects. You set this parameter by keying in a numerical value or by using the mouse to set the tuner to a value within the range of 0 to 1.
Shiny
The Shiny parameter represents the specular exponent and controls the size of specular highlights. You set this parameter by keying in a numerical value or by using the mouse to set the tuner to the desired value within the range of 0 to 30.
Channel Mask
The Channel mask parameter enables you to inhibit the modification of any channel in the primary input by deselecting a channel icon. By default, the Red, Green, and Blue channels are active; the Alpha and Other channels are masked.
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