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Note: All the filters described here may also be applied to selected regions.
The color equalizer allows you to change the brightness and contrast and perform some sort of color shifts. The usage should be obvious.
Note: The manipulations will performed in the same order in which the sliders appear in the popup window.
I added this filter, because the plugin based on pnmsmooth, which i used before could not handle images containing transparent regions.
This filter is mainly intended in order to remove background pixels which remained left, when a background was removed by the flood fill tool (doing this by hand would be annoying). It will not change border pixels.
Note, that removing isolated pixels may have the effect, that pixels are isolated, which where not isolated before.