Microtek ScanMaker 6100 Pro User Manual page 62

alignment.
Using the Color Output Meter
The Color Output Meter is useful if you wish to adjust the shadow
and highlight points of an image.
As you pass over a point in the image, the Color Output Meter will
show the appropriate RGB values of that point in the image. The
significance of the numbers is explained below.
There are two numbers shown in the Color Output Meter. The
first number represents the raw color data taken by the
scanner; the second number represents the resulting value
after color correction or image enhancement is applied to the
image.
The values can be anywhere from 0 to 255, with 0 as the black
point, 255 as pure white, and all other values in between
corresponds to shades of varying degrees between black and
white.
The values as a whole represent color Info for the sample size
selected in the Color Meter Options button (discussed below).
For instance, if you chose 3 x 3 as your sample size and your
R value reads 23, that shows your red value of 23 is the
average of a 3-pixel by 3-pixel area.
Pixel-value Info is useful especially if you are making color
corrections based on color values. Knowing this, you can modify the
shadow and highlight points of an image, then come back to the
same point in the image, and verify through the Color Output Meter
that the RGB values have indeed changed.
Using the Color Meter Options button
The Color Meter Options button provides options for choosing how
extensively the color information will be read — whether the color
information will apply to a pixel, a 2-pixel by 2-pixel area or wider