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Contour
The Contour transformation creates contour lines along areas of equal luminance. It can be used to outline features in an image. You have the option of either including the image in the final output or outputting just the contour lines.
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Number of Contour Lines
Contour lines are equally spaced in brightness.
Contour Line Color
The color of the contour lines.
Background
The background can be the original image or background mode which allows you to choose solid background color. If you pick background mode, the original image is excluded from the output producing a paint by numbers effect.
Background Color
The color of the background in background mode.
Transparency
The transparency of the contour lines.
Smooth
Selects whether the contour lines are smoothed.
This control lets you choose how brightness is defined for calculating brightness intervals for contour lines. The choices are HSL and HSV.