10.2.  Bump Map

Revision History
Revision $Revision: 2439 $ 2008-01-09 ude
Preview

Parameter setting results are interactively displayed in preview. Scroll bars allow you to move around the image.

Bump Map

This drop-down list allows you to select the image that will be used as a map for bump-mapping. This list contains images that are present on your screen when you launch the filter. Images opened after starting filter are not present in this list.

Map Type

This option allows you to define the method that will be used when creating the map image:

  • Linear: bump height is a direct function of luminosity.

  • Sinusoidal: bump height is a sinusoidal function of luminosity.

  • Spheric: bump height is a spheric function of luminosity.

Compensate for darkening

Bump-mapping tends to darken image. You can compensate this darkening by checking this option.

Invert bump-map

Bright pixels default to bumps and dark pixels to hollows. You can invert this effect by checking this option.

Tile bump-map

If you check this option, there will be no relief break if you use your image as a pattern for a web page: patterns will be placed side by side without any visible joins.

Azimut

This is about lighting according to the points of the compass (0 - 360). East (0°) is on the left. Increasing value goes counter-clockwise.

Elevation

That's height from horizon (0.50°), up to zenith (90°).

Depth

With this slider, you can vary bump height and hollow depth. The higher the value, the higher the difference between both. Values vary from 1 to 65.

X/Y offsets

With this slider, you can adjust the map image position compared with the image, horizontally (X) and/or vertically (Y).

Sea Level

If your image has transparent areas, they will be treated like dark areas and will appear as hollows after bump-mapping. With this slider, you can reduce hollows as if sea level was raising. This hollows will disappear when sea level value reaches 255. If the Invert bump-map option is checked, transparent areas will be treated as bright areas, and then Sea Level slider will plane bumps down.

Ambient

This slider controls the intensity of ambient light. With high values, shadows will fade and relief lessen.