The Emboss filter uses the contrast of an image to remap contours to create a 3D effect, similar to bas-relief. Like many of the other filters, it's very versatile and most useful when combined with other techniques.
About the Emboss filter
This filter can be found in the Filter menu, in the Colors category.
Settings
The following settings can be adjusted in the effects dialog:
Radius—controls the number of pixels affected. Type directly in the text box or drag the slider to set the value.
Amount—controls the intensity of the filter. Type directly in the text box or drag the slider to set the value.
Rotation—controls the angle of the lighting. Drag the dial to set the value.
Monochrome—when selected, the final effect only contains grayscale values.