This filter works on color borders. It spreads pixels that differ in a specified way from their neighboring pixels.
Note | |
---|---|
These options are described in Section 2, “Common Features”. |
The examples will be about the following image:
Pixels will be propagated from upper value pixels towards lower value pixels. So bright areas will enlarge.
Pixels will be propagated from lower value pixels towards upper value pixels. So dark areas will enlarge.
On a border between the selected thresholds, the average of both values is propagated.
The propagated areas will be filled with the foreground color of the toolbox.
A color selector opens, with a color picker.
Only areas with the selected color will propagate. With this option, soft and fuzzy edges don't propagate well.
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.
A pixel will be propagated (spread) if the difference in value between the pixel and its neighbor is no smaller than the lower threshold and no larger than the upper threshold.
That's the propagating amount. The higher it will be the more colored the propagation will be.
You can select one or more directions.
If checked, the pixel's color channels (gray channel on grayscaled images) will be propagated. The option is checked by default, of course.
If checked, the pixel alpha value will be propagated, otherwise the pixel will get the alpha of the neighboring pixels.