Levenhuk C800 NG Digital Camera, USB 2.0 - Manual (Page 86)

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maximize the contrast between the brightest and darkest pixels in the
local window region.
Linear This option distributes the histogram linearly across the intensity scale.
This function produces a high contrast image with the highest possible
dynamic range.
Logarithmic This option concentrates the histogram at the low end of the scale. This
function produces a high contrast image with little dynamic image. It
will tend to darken the image overall. It is useful for increasing the
contrast in a very light image.
Exponential This option concentrates the histogram at the high end of the scale. This
function produces a high contrast image with little dynamic image. It
will tend to lighten the image overall. It is useful for increasing the
contrast in a very dark image.
12.1.2 Edge Enhance
Sobel Check this filter to enhance just the principal edges in an image. The
Sobel applies a mathematical formula to a 3x3 neighborhood to locate
and highlight its edges.
Roberts Check this filter to enhance fine edges in an image. The Roberts filter is
not a convolution filter. It applies a mathematical formula upon a 4 x 4
neighborhood to produce its effect. The upper left pixel in the
neighborhood is the one that is replaced.
Sculpt Check this filter to apply a sculpted effect on the image.