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This filter simulates the effect you get when you light up a wall with
a spot. It doesn't produce any drop shadows and, of course, doesn't
reveal any new details in dark zones.
5.4.2. Activate the filter
This filter is found in the image window menu under
→ → .
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Preview
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When Interactive is checked, parameter
setting results are interactively displayed in preview without
modifying the image until you click on OK
button.
If Interactive is not checked, changes are
displayed in preview only when you click on the
Update button.
This option is useful with a slow computer.
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General Options
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Transparent Background
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Makes destination image transparent when bumpmap height
is zero (height is zero in black areas of the bumpmapped
image).
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Create New Image
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Creates a new image when applying filter.
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High Quality Preview
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For quick CPU...
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Distance
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You can specify the distance of the light source from the
center of the image with this slider. The range of values
is from 0.0 to 2.0.
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Light
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In this tab, you can set light parameters. With
Light 1, 2,...6: You can create six light
sources and work on each of them separately.
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Light Type
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This filter provides several Light Types
in a drop-down list:
Point: displays a blue point at center
of preview. You can click and drag it to move light all
over the preview.
Directional: the blue point is linked
to preview center by a line which indicates the direction
of light.
None: This deletes the light source
(light may persist...).
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Light Source Color
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When you click on the color swatch, you bring a dialog up
where you can select the light source color.
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Intensity
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With this option, you can set light intensity.
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Position
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Determines the light point
position according to three coordinates: X coordinate for
horizontal position, Y for vertical position, Z for source
distance (the light darkens when distance increases). Values
are from -1 to +1.
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Direction
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This option should allow you to fix the light direction in
its three X, Y
and Z coordinates.
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Isolate
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With this option, you can decide whether all light sources
must appear in the Preview, or only the source you are
working on.
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Lighting Preset
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You can save your settings with the Save
and get them back later with the
Open.
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Material
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These options don't concern light itself, but light reflected by
objects.
Small spheres, on both ends of the input boxes, represent the
action of every option, from its minimum (on the left) to its
maximum (on the right). Help pop ups are more useful.
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Glowing
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With these option, you can set the amount of original
color to show where no direct light falls.
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Bright
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With this option, you can set the intensity of original
color when hit directly by a light source.
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Shiny
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This option controls how intense the highlight will be.
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Hell
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With this option, higher values make the highlight more
focused.
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Metallic
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When this option is checked, surfaces look metallic.
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Bump Map
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In this tab, you can set filter options that give relief to the
image. See Bumpmapping.
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Enable Bump Mapping
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With this option, bright parts of the image will appear
raised and dark parts will appear depressed. The aspect
depends on the light source position.
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Bump Map Image
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You have to select there the grey-scale image that will
act as a bump map.
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Curve
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Four curve types are available:
Linear,
Logarithmic,
Sinusoidal and
Spherical. See
Bump Map plug-in for
explanations.
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Maximum Height
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This is the maximum height of bumps.
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Environment Map
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Enable Environment Mapping
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When you check this box, the following option is enabled:
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Environment Image
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You have to select there a RGB image, present on your
screen. Please note that for this option to work you
should load another image with gimp
before using it.
An example can be found at
[BUDIG01].
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