HP Scanjet 7450c HP Scanjet 7400C Series Scanner Mac - (English) User Manual - Page 44

Setting pixel output levels, White, Black, Controls, Advanced, Adjust Exposure, Output Levels

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44 Scanning from HP PrecisionScan Pro Setting pixel output levels The output levels setting lets you create interesting effects for scanned pictures. When you select this command, the Black and White output levels appear. By default, white is set to 255, and black is set to 0. Decreasing the White output level makes the overall image darker. Increasing the Black output level makes the image more faded. Changing the White output level value to 0 and the Black output level value to 255 inverts the colors in the image. To change the ranges for the numbers in the White and Black fields, see the Controls tab of "Setting preferences" on page 60. Tip To use an image as a light background for dark text, such as for an overhead transparency, increase the Black output level until the image is as faint as you want. To use an image as a dark background for light text, such as for color slides, decrease the White output level value until the image is as dark as you want. Back to TOC To change output levels 1 On the Advanced menu, click Adjust Exposure. 2 Click the Output Levels check box. The dialog box expands to display the current White and Black output levels. 3 To change the levels, do one of the following: q Click on the one side of a slider. q Type a different number in the White or Black field and press ENTER. q Click the Up or Down arrow next to the White field or Black field. The result of the changes to output levels can be seen in the preview area. To return to the default settings 1 On the Advanced menu, click Adjust Exposure. 2 Click Auto to return the midtone, highlight, shadow, and output levels to the default settings for this scanned image.

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44
Scanning from HP PrecisionScan Pro
Back to TOC
Setting pixel output levels
The output levels setting lets you create interesting effects for scanned
pictures. When you select this command, the Black and White output
levels appear. By default, white is set to 255, and black is set to 0.
Decreasing the White output level makes the overall image darker.
Increasing the Black output level makes the image more faded.
Changing the White output level value to 0 and the Black output level
value to 255 inverts the colors in the image.
To change the ranges for the numbers in the
White
and
Black
fields,
see the
Controls
tab of
"Setting preferences" on page 60
.
Tip
To use an image as a light background for dark text, such
as for an overhead transparency, increase the Black
output level until the image is as faint as you want.
To use an image as a dark background for light text, such
as for color slides, decrease the White output level value
until the image is as dark as you want.
To change output levels
1
On the
Advanced
menu, click
Adjust Exposure
.
2
Click the
Output Levels
check box. The dialog box expands to
display the current White and Black output levels.
3
To change the levels, do one of the following:
●
Click on the one side of a slider.
●
Type a different number in the
White
or
Black
field and press
E
NTER
.
●
Click the
Up
or
Down
arrow next to the
White
field or
Black
field.
The result of the changes to output levels can be seen in the preview
area.
To return to the default settings
1
On the
Advanced
menu, click
Adjust Exposure
.
2
Click
Auto
to return the midtone, highlight, shadow, and output
levels to the default settings for this scanned image.