Genius VividPro II, User Manual

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Chapter IV. The TWAIN Interface
43
The highlight represents the high
(bright) end of the color spectrum. If the highlight
value of the Master channel is lowered to 245, all
color values between 245 and 254 will be given
the value of 255 (white). Thus, lowering the
highlight of the Master channel brightens the
whole picture. Doing this also increases the color
contrast because all the remaining pixels between
the midtone and the highlight will be automatically
redistributed over the midtone to 255 range. This
redistribution serves to increase the difference
between shades of color.
If the highlight for one of the Red, Green or
Blue channels is adjusted then the results will only
affect pixels of that color or containing
combinations of that color (i.e. Yellow contains
Green and Blue and would thus also be affected
by changes to one of these channels).
The midtone is used to adjust the mid-
range of color values. Raising the midtone
darkens the image and lowering the midtone
brightens the picture. For balanced color the
midtone should be set at 50%.
The shadow represents the low (dark)
end of the color spectrum. If the shadow value on
the Master channel is raised to 10, all color values
between one and ten will be given the value of
zero (black). Thus, raising the shadow darkens
the entire image and raising the shadow in a
specific color channel darkens pixels of that color.
Raising the shadow also increases the color
contrast of darker tones (the range between the
midtone and the shadow).
The Default button at the bottom of the window
sets the shadow to 0, the highlight to 255 and the
midtone to 50% - the lowest contrast settings.