Epson Expression 636 User Manual - TWAIN 32 - Page 100

Gamma Correction, Expression 636 Scanner Settings, CRT Display

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Gamma Correction Gamma, or tone, correction, adjusts the light intensity ratio between the original image and the output data. It brings out more detail in areas of both highlight and shadow. When the image is reproduced on certain types of output devices, the tones of the image will be closer to those of the original. The term "gamma" (γ) means the shape and slant of the line on the graph that shows the ratio, as shown below. Lighter Data output CRT Display A CRT Display B Printer Output A Printer Output B Printer Output C Darker Image input Lighter Gamma correction provides five settings, and can be combined with all other scanner functions. Choose an appropriate setting from the five modes below. t CRT Display A The output data is in proportion to the original image, as shown in the above graph. This setting is suited for most types of computer displays which can display an image in 1-bit/pixel/color format. This mode is also suited for images without continuous tones, such as line art (γ = 1). B-10 Expression 636 Scanner Settings

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B-10
Expression 636 Scanner Settings
Gamma Correction
Gamma, or tone, correction, adjusts the light intensity ratio
between the original image and the output data. It brings out
more detail in areas of both highlight and shadow. When the
image is reproduced on certain types of output devices, the
tones of the image will be closer to those of the original. The term
“gamma” (
γ
) means the shape and slant of the line on the graph
that shows the ratio, as shown below.
Gamma correction provides five settings, and can be combined
with all other scanner functions. Choose an appropriate setting
from the five modes below.
CRT Display A
The output data is in proportion to the original image, as
shown in the above graph. This setting is suited for most
types of computer displays which can display an image in
1-bit/pixel/color format. This mode is also suited for images
without continuous tones, such as line art (
γ
= 1).
Lighter
Darker
Lighter
Image input
Data output
CRT Display A
CRT Display B
Printer Output A
Printer Output B
Printer Output C