White/Black Points - Microtek ScanWizard Bio Reference Manual

White/Black Points

The White/Black Points tool is used to change the shadow and highlight points
of an image.
By using this tool, you can manipulate an image to either bring out the highlights
in a very dark image, or bring out more of the shadows in a very light image. The
White/Black Points tool can also be used to neutralize the color cast in the
highlight and shadow regions.
A
B
A. Histogram
The histogram is a graphic representation of how all the pixels in an image are
distributed across brightness and darkness levels. The darkest pixels are at the
left; the lightest pixels are at the right.
A histogram skewed heavily to the left indicates that the image has many more
dark pixels than light. Conversely, a histogram skewed heavily to the right will
indicate a light image as it has more light pixels than dark. The height of the
histogram indicates the number of pixels at that point in the histogram.
B. Sliders
The sliders are used to adjust the Black and White points of the image. The
values of the black and white points are reflected in the edit boxes below.
Microtek ScanWizard Bio Reference Manual
C
D
E
F
G
49