Image Adjustment Controls; Auto (Automatic Contrast Control) - Microtek ScanMaker IIG User Manual

Image Adjustment controls

How Auto settings are applied
The Auto setting works by calculating
the image settings of the current scan
frame and applies those settings to
the current scan frame.
If you draw a scan frame around part
of an image that is light and then
apply Auto, that part of the image
within the scan frame becomes
darker. This is because Auto takes
that dark portion and remaps the
pixels to a broader range. The light
pixels are then spread further apart,
resulting in a darker image.
Conversely, if your scan frame
encloses a darker part of the image
and then apply Auto, the entire image
becomes lighter. The dark pixels are
remapped to a broader range,
resulting in a lighter image.
When you use Auto, it is helpful to
turn on the Smoked Glass
Background feature (in the
Preferences menu in the Preview
window). This will allow you to see
clearly the part of the image within the
current scan frame.
5-48 Microtek User's Guide for Windows
The Image Adjustment controls include the Auto button and
the Color Correction button, located below the Image
Dimension Controls.

Auto (Automatic Contrast Control)

The Auto button optimizes the contrast of scanned images by
making adjustments to the Shadow/Midtone/Highlight
values.
The Auto button is dimmed if the image type selected in the
Type box is line art or halftone.
(within scan
frame). Auto
settings will
be based on
the settings
image part.
Entire image
has darkened
applied, based
on settings of
the image part
within the scan
Selected
image part
of this
Before Auto
with Auto
frame.
After Auto