Canon CanoScan FS2700F User Guide - Page 56

Color Correction - Gamma Value Settings, Matching the Gamma Value to the Display Characteristics

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STEP 4 Color Correction - Gamma Value Settings You can adjust the color by changing the gamma value for the display monitor. This method is suitable for matching the image output to the particular characteristics of the display monitor in use. The method is applicable to 8-bit grayscale, 12-bit grayscale, 24-bit color (when ColorSync™ is off) and 36-bit color images. Matching the Gamma Value to the Display Characteristics The relationship between the data sent to a display monitor (input) and the data shown on the display (output) is expressed as the display monitor gamma value. Different display monitors may have different gamma values, which typically range from 1.4 to 2.2. Without adjustment, most display monitors reproduce images slightly darker than the original. Plug-in module FS can automatically adjust the gamma value for faithful reproduction if the display monitor has a gamma value of 1.4. Display monitors with other default gamma values have to be set manually. Gamma value Plug-in module FS and the display monitor have different gamma values. During a scanning job, Plug-in module FS receives the image from the scanner as input and sends it to the parent application as output. The gamma value in this interval where Plug-in module FS converts input to output is the Plug-in module FS gamma value. On the other hand, the data received from Plug-in module FS as input is sent to the display monitor as output. The gamma value in this interval where the image input from Plug-in module FS is converted to output for the display monitor is the display monitor gamma value. Setting the display monitor gamma value causes the scanner gamma value to be calibrated automatically as the inverse value. For example, if the display monitor gamma value is set to 1.4, then the scanner gamma value is calibrated at 0.71 (the inverse of 1.4). Hint • Please read the documents shipped with your display or contact the manufac- turer's customer service department to obtain the correct gamma value for your particular display model. • If you intend to adjust the color tone with ColorSync™, change the settings in the ColorSync™ System control panel (found within the Control Panels folder) and do not manually change the gamma value settings as described in the following pages. See Auto Tone Correction (ColorSync™) (p. 64). 56 56

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Color Correction - Gamma Value Settings
You can adjust the color by changing the gamma value for the display monitor. This
method is suitable for matching the image output to the particular characteristics of
the display monitor in use. The method is applicable to 8-bit grayscale, 12-bit grayscale,
24-bit color (when ColorSync™ is off) and 36-bit color images.
Matching the Gamma Value to the Display Characteristics
The relationship between the data sent to a display monitor (input) and the data
shown on the display (output) is expressed as the display monitor gamma value.
Different display monitors may have different gamma values, which typically range
from 1.4 to 2.2. Without adjustment, most display monitors reproduce images
slightly darker than the original. Plug-in module FS can automatically adjust the
gamma value for faithful reproduction if the display monitor has a gamma value of
1.4. Display monitors with other default gamma values have to be set manually.
Gamma value
Plug-in module FS and the display monitor have different gamma values.
During a
scanning job, Plug-in module FS receives the image from the scanner as input and
sends it to the parent application as output.
The gamma value in this interval
where Plug-in module FS converts input to output is the Plug-in module FS gamma
value. On the other hand, the data received from Plug-in module FS as input is sent
to the display monitor as output.
The gamma value in this interval where the image
input from Plug-in module FS is converted to output for the display monitor is the
display monitor gamma value.
Setting the display monitor gamma value causes the scanner gamma value to be
calibrated automatically as the inverse value.
For example, if the display monitor
gamma value is set to 1.4, then the scanner gamma value is calibrated at 0.71 (the
inverse of 1.4).
Hint
• Please read the documents shipped with your display or contact the manufac-
turer’s customer service department to obtain the correct gamma value for
your particular display model.
• If you intend to adjust the color tone with ColorSync™, change the settings in
the ColorSync™ System control panel (found within the Control Panels folder)
and do not manually change the gamma value settings as described in the
following pages.
See Auto Tone Correction (ColorSync™)
(p. 64).
S T E P
4