Canon CanoScan FB 1200S User Manual - Page 46

Value = 1, Value < 1, The Relationship Between the Tone Curve and Image Brightness

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STEP 4 The Relationship Between the Tone Curve and Image Brightness Tone curve values fall with a range of 0.01 to 10.00. A value of 1 appears as a straight line in the graph, and if the value is any value other than one, the line on the graph will appear curved. The relationship between the shape of the curve and image brightness is explained below. Value = 1 Output Input and output and are equal and the curve appears as a straight line, and the input image is displayed on the screen without ª adjustment. Value < 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. Value > 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. Output Output Input ª Input ª Input CAUTION • Color can be adjusted automatically even if the scan mode is set to 24-bit Color and ColorSyncTM is selected. • The tone curve cannot be adjusted for a black and white image because mid-tones are shown as either black or white. To adjust the brightness of a black and white image, use the threshold setting. (p. 52) 46 46

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The Relationship Between the Tone Curve and Image Brightness
Tone curve values fall with a range of 0.01 to 10.00.
A value of 1 appears as a straight
line in the graph, and if the value is any value other than one, the line on the graph will
appear curved. The relationship between the shape of the curve and image brightness
is explained below.
Value = 1
Input and output and are equal
and the curve appears as a
straight line, and the input image
is displayed on the screen without
adjustment.
Value < 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.
Value > 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
• Color can be adjusted automatically even if the scan mode is set to 24-bit
Color and ColorSync
TM
is selected.
• The tone curve cannot be adjusted for a black and white image because
mid-tones are shown as either black or white. To adjust the brightness of a
black and white image, use the threshold setting.
(p. 52)
Output
Input
Output
Input
Output
Input
S T E P
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