HP 4400C HP Scanjet 4400C/5400C Series Scanner Windows - (English) User Manual - Page 59

Changing the black and white threshold, Black & White Bitmap, Output, Advanced

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58 Scanning from HP Precisionscan Pro Changing the black and white threshold Changing black and white threshold only applies to images using the Black & White Bitmap output type. The threshold is a value in the image that represents the border between black and white. All values in the image that are lighter than the threshold appear as white, and all values darker appear as black. The image has a default threshold value. Choosing a number closer to zero makes more values appear as white. Choosing a higher number makes more values appear as black. Threshold at 127 (the default for this image) Threshold at 45 Back to TOC 1 Make sure that Black & White Bitmap is selected on the Output Type menu. The selection should have a dot beside it. 2 On the Advanced menu, click Adjust Black & White. 3 Do one of the following: l Drag the slider. l Type a new value in the field and press ENTER. l Click the Up or Down arrow next to the field. 1 On the Advanced menu, click Adjust Black & White. 2 Click Auto.

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58
Scanning from HP Precisionscan Pro
Back to TOC
Changing the black and white threshold
Changing black and white threshold only applies to images using the
Black & White Bitmap output type. The threshold is a value in the
image that represents the border between black and white. All values
in the image that are lighter than the threshold appear as white, and all
values darker appear as black.
The image has a default threshold value. Choosing a number closer to
zero makes more values appear as white. Choosing a higher number
makes more values appear as black.
1
Make sure that
Black & White Bitmap
is selected on the
Output
Type
menu. The selection should have a dot beside it.
2
On the
Advanced
menu, click
Adjust Black & White
.
3
Do one of the following:
l
Drag the slider.
l
Type a new value in the field and press
E
NTER
.
l
Click the
Up
or
Down
arrow next to the field.
1
On the
Advanced
menu, click
Adjust Black & White
.
2
Click
Auto
.
Threshold at 127
(the default for this image)
Threshold at 45