Konica Minolta DiMAGE Scan Dual III AF-2840 - Manual (Page 71)

The tone curve is a graphic representation
of the brightness and color levels of the
image. The bottom axis is the 256 levels of
the original image (input data) from black
to white. The vertical axis is the corrected
image (output data) with the same scale
from top to bottom.
The bottom left portion of the graph repre-
sents the dark colors and shadow areas of
the image. The middle section represents
the mid-tones: skin, grass, blue sky. The
top right section is the highlights: clouds,
lights. Changing the tone curve can affect
the brightness, contrast, and color of the
image.
Input
Output
Highlights
Midtones
Shadows
Shadows
71
Tone curve and histogram corrections
The histogram indicates the distribution of
pixels with specific brightness and color
values in the image. Using the histogram
can maximize the output of the image
data. Changes made with the histogram
are also displayed on the tone curve.
Number of pix
els
Luminance levels from 0 to 255
Highlights
Mid-tones