Konica Minolta PS7000 Twain Driver and Overlay Manager Software Installation a - Page 15

Brightness & Contrast Controls

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Brightness & Contrast Controls This set of controls allows users to change the composition of the scanned image as detailed below. Please note that when using the slider bars you may notice some slight lag or resistance -- this is normal and is due to the bi-directional communication between the driver and scanner. Automatic Brightness - Check this box if you wish to have the scanner perform a prescan and apply an appropriate brightness setting based on the detected original. Automatic brightness will assume an original of normal exposure. Brightness - Changing these settings will cause the scanned image to appear lighter or darker. When automatic brightness is selected this function will work as a small adjustment to the brightness applied by the AB function and the slider can be set between 0 and 30. When AB is not selected this slider will apply an absolute brightness based on a setting between 0 and 90. In grayscale a lower brightness setting will result in each pixel being given a value closer to white while a higher setting will cause each pixel to be given a value closer to black. When scanning with Image Type set for black and white, a low brightness setting will cause the thresholding process to result in more pixels being set to white while a higher brightness will result in more pixels being set to black. Please note that all Brightness and Contrast controls are applied prior to any Halftone or Photo settings. Brightness settings can be adjusted using the front panel Auto, Darker and Lighter buttons. G/S Auto Brightness of 7 G/S Auto Brightness of 15 G/S Auto Brightness of 22 Contrast - The contrast settings extend from 0 to 14. Changing these settings will cause the scanned image to either increase or decrease the range between dark and light areas. A low contrast setting will result in each pixel being set to a value closer to the median (gray) while a high contrast setting will result in each pixel being set to a value closer to its absolute. In other words, light pixels get lighter and dark pixels get darker. A high contrast can be desirable when trying to enhance dark objects on a less-than-white background or when trying to enhance textual data in a grayscale image. Contrast cannot be adjusted from the front panel.

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Brightness & Contrast Controls
This set of controls allows users to change the composition of the scanned image as detailed
below.
Please note that when using the slider bars you may notice some slight lag or resistance
-- this is normal and is due to the bi-directional communication between the driver and
scanner.
Automatic Brightness
– Check this box if you wish to have the scanner perform a prescan
and apply an appropriate brightness setting based on the detected original.
Automatic
brightness will assume an original of normal exposure.
darker.
When automatic brightness is selected this function will work as a small
adjustment
and 30. W
ased on a
setting between 0 and 90.
In grayscale a lower brightness setting will result in each pixel being given a value closer
to white while a higher setting will cause each pixel to be given a value closer to black.
When scanning with Image Type set for black and white, a low brightness setting will
cause the thresholding process to result in more pixels being set to white while a higher
brightness will result in more pixels being set to black. Please note that all Brightness and
Contrast controls are applied prior to any Halftone or Photo settings. Brightness settings
can be adjusted using the front panel Auto, Darker and Lighter buttons.
Brightness
– Changing these settings will cause the scanned image to appear lighter or
to the brightness applied by the AB function and the slider can be set between 0
hen AB is not selected this slider will apply an absolute brightness b
G/S Auto Brightness of 7
G/S
Auto Brightness of 15
G/S Auto Brightness of 22
Contrast
– The contrast settings extend from 0 to 14.
Changing these settings will cause
the scanned image to either increase or decrease the range between dark and light areas. A
low contrast setting will result in each pixel being set to a value closer to the median (gray)
while a high contrast setting will result in each pixel being set to a value closer to its
absolute.
In other words, light pixels get lighter and dark pixels get darker. A high contrast
can be desirable when trying to enhance dark objects on a less-than-white background or
when trying to enhance textual data in a grayscale image. Contrast cannot be adjusted from
the front panel.