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43
S T E P 4
The Relationship Between the Gamma Curve and Image Brightness
Gamma curve values fall with a range of 0.01 to 10.00. A gamma value of 1 appears
as a straight line in the gamma graph, and if the value is any value other than one, the
line on the gamma graph will appear curved. The relationship between the shape of
the gamma curve and image brightness is explained below.
Gamma = 1
Input and output and are equal
and the gamma curve appears as
a straight line, and the input
image is displayed on the screen
without adjustment.
Gamma < 1
The data bends upward from the
input shadow to highlight into
the output area bending the curve
up and making the adjusted
image brighter in the display.
Gamma > 1
The data bends downward from
the input shadow to highlight
away from the output area
bending the curve down and
making the adjusted image darker
in the display.
CAUTION
• The gamma curve cannot be adjusted for a high definition color image that
has been set with ColorSync because the tone adjustment is performed
automatically.
• The gamma curve cannot be adjusted for a Black & White (Line) image
because mid-tones are shown as either black or white. To adjust the
brightness of a Black & White image, use the threshold setting. (p. 54)
Output
Input
Output
Input
Output
Input
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