Optipix User's Guide:  Edge Enhancer (Difference of Gaussians)

The Edge Enhancer uses a technique called Difference of Gaussians. This technique is quite similar to the common darkroom technique of unsharp masking. This is where a slightly out-of-focus negative can be used to create a mask that smooths out variations in brightness in the final print except where edges were present. If you set the Smoothing Sigma slider to 0, so that noise in the original image isn't smoothed out, the action of the Edge Enhancer plug-in is virtually identical to an unsharp masking procedure in the darkroom.

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