User Guide

GNU Image Manipulation Program
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Figure 15.159: To bottom only
The same as above with To bottom direction only checked.
• Middle Value to Peaks: On a border between the selected thresholds, the average of both values is propagated.
Figure 15.160: Middle Value to Peaks Middelverdi til spissane
(a) A thin border with a transitional
color has been added to objets. It
is not visible around objects with
smoothed borders.
(b) Green area zoomed x800.
A thin border (one pixel wide)
has been added. Its value is the
average between grey (90%)
and green (78%) : (90 + 78) /
2 = 84.
• Foreground to Peaks: The propagated areas will be filled with the foreground color of the toolbox.
Figure 15.161: Foreground to Peaks
In this example, the foreground color in Toolbox is Red. A thin border, one pixel wide, red, is added around objects. With
smoothed objects, this border is located at the furthest limit of smoothing. Here, another border appears inside. This is an
artefact due to the small size of the object which makes the smooting area of opposite sides to overlap.
• Only Foreground: Only areas with the Toolbox Foreground color will propagate.