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Adjusting the Printer Picture Quality
59
GAMMA adjustment (GM parameter)
You can adjust the gamma value. The default is 0.
Pressing B on the control button of the printer increases
the halftone of each of the RGB data in the direction that
the brightness increases.
Pressing b on the control button decreases the halftone
of each of the RGB data in the direction that the
darkness increases.
SHARPNESS
SHARPNESS adjustment is a function for adding
emphasis to edges in pictures. This function cannot be
used to increase the resolution. It is intended for
changing the sharpness.
SHARPNESS can be used as a parameter to improve
pictures, but increasing the sharpness too much will not
produce a natural picture. Generally, the default setting
is recommended. When a large print size is used and
SHARPNESS is set to a large value, picture quality does
appear to improve.
Contrast
In addition to the sharpness function, it is possible to add
sharpness to the image by adding the contrast of dark
and light. Contrast can be set using the DARK and
LIGHT items in the menu screen. Increasing the DARK
and LIGHT values in the plus direction increases the
contrast, and a high contrast image can be obtained. The
downside, however, is that increasing the contrast values
in the plus direction diminishes the amount of
information about white and black tones, and as a result,
the white and black gradation becomes coarser. Thus, an
appropriate contrast setting is required. We recommend
setting the contrast to +2 or +3.
Using Guide Print to Check the
Adjustment Results
You can print a guide picture to check the adjustment
results.
1
Set the mode dial to .
2
Press the b or B control button and select the guide
picture to print.
3
Press the / button.
The layout preview screen appears.
4
Select Guide Print-RGB or Guide Print-DLGm
using the b or B control button.
5
Select whether to print in color or black & white by
pressing the V control button.
6
Press the / button again.
The guide picture is printed.
Check the printed picture and readjust the picture
quality if necessary.
For details on how to make adjustments using the
printed guide picture, see “Guide Print Function” on
page 60.
Note
The guide picture printout cannot be used to check
sharpness.
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