HP DesignJet 815MFP User Manual download pdf (Page 83)

hp designjet 815mfp & scanner 4200 77

background clean value. As with black enhance, background clean

should be used with caution, as it can also affect some of the other

light colors.

Both black enhance and background clean function as ‘cutoff’

values in which pixels under or over a certain value are affected by

the setting. You define cutting points on a scale of low to high

lightness measured in values from 0 to 255. The default value of

both options is zero (no effect).

Example:

You have copied an original and want to improve it by making the

text blacker and the background whiter:

• Adjust the black enhance value upwards from its default of

zero (to 25, for example) and thus make pixels with low

lightness values go to black.

• Adjust the background clean value upwards from its default of

zero (to 25, for example) and thus make the pixels at high

lightness levels go to white.

You can give your copy sharper lines with the Sharpen option. The

Sharpen feature identifies edges in the image and intensifies them.

sharpen/blur

The Blur feature blends colors and thus removes unwanted ‘noise’

during image capture. Many images are created with dithering,

which is used for representing different colors in the original, and

this dithering often creates unnecessary ‘noise’ in the image.

Blurring smoothes out unwanted transitions between colors. With

Black and White copying the Blur feature smoothes out gray dither

by removing unwanted sharp transitions between excessive shades

of gray.

Don’t think of blurring as the opposite of sharpening. Sharpening

works on the image’s edges only while blurring looks at whole color

or graytone areas and smoothes them out.

tip

Using Sharpen together with the Blur feature can often enhance

image quality by first blurring away noise in the image and then

sharpening the result.

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HP DesignJet 815MFP User Manual Page 83