User`s guide

INDEX
73
This is a simple mapping of the darkest color to 0.00 intensity and the brightest
color to 0.95 intensity.
White balance
VueScan analyzes the image and adjusts it to make neutral colors appear more
neutral.
Landscape
VueScan analyzes the image and adjusts it to make neutral colors appear more
neutral, and sky blue and green foliage colors more lifelike.
Portrait
VueScan analyzes the image and adjusts it to make neutral colors appear more
neutral and skin tones more lifelike.
Basic Option: This option is displayed when whenInput | Lock image color (p. 62) isn't
set.
Color | Neutral red/green/blue
This option is normally set by clicking with the right mouse button on a neutral color in
the image.
Advanced Option: This option is displayed whenInput | Lock image color (p. 62) isn't
set, and when "Color | Color balance" is set to "Manual".
Color | Black point (%)
The black point is used by the color balance algorithm and is computed by using the
histogram of each color in the image. Use this option to leave the black point at the
minimum intensity (0%), or to choose the black point such that some percentage of the
pixels in the image are below the black point.
The default black point is 0. Setting a higher value will cause tones close to black to
become pure black, which can improve contrast. However, setting the black point too
high will cause shadow detail to be lost.
Advanced Option: This option is displayed when "Color | Color balance" is set
andInput | Lock image color (p. 62) isn't set.
Color | Black point red/green/blue
This option lets you set the black point manually. Note that these values are in linear
space, not gamma corrected space, so the only practical way to use these values is to