User Guide

GNU Image Manipulation Program
514 / 653
Figure 15.162: Only Foreground
In this example, the foreground color in Toolbox is that of the green object. After applying filter several times, the green area is
clearly enlarged.
• Only Background: Only areas with the Background color will propagate.
• More Opaque and More Transparent: These commands work like More White and More Black. Opaque (transparent)
areas will be propagated over less opaque (transparent) areas. These commands need an image with an Alpha channel.
Figure 15.163: More opaque
(a) Original layer, with a transpar-
ent background.
(b) Filter applied several times: the
green, opaque, area got increased.
Parameters Settings
Lower / Upper Threshold Lower Threshold and Upper Threshold: These commands allow you to set the Value range
that will be concerned by Propagate.
Propagating Rate Propagating Rate: That’s the propagating amount. The higher it will be the more colored the propaga-
tion will be.
Propagating Direction Propagating Direction: You can select one or more directions.