It might seem that other filters should belong in this group that aren't in this group (any blur filter, etc.) because they also manipulate the values of pixels. This filter group is reserved to a minimum set of filters whose decision to adjust a channel value or not is limited to the knowledge obtained within the pixel scope of an image. The blurring/convolution filters look at a minimum of 8 different other pixels before changing the value of one pixel.
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Philip D.S. Thoren ( email@example.com )
University Of Massachusetts at Lowell