User`s guide

ManualsBrandsMicrotek ManualsComputer equipmentScanMaker 5

213

214

215

216

217

218

219

220

221

222

IntroductionIntroduction

Introduction

The Unsharp masking filter is used to adjust the contrast of

edge detail, creating the illusion of more image sharpness.

This filter can be useful for refocusing an image that has

become blurry from interpolation or scanning, and it is an

essential tool for doing CMYK color separation. In general,

Unsharp masking is needed to render sharp color

reproductions, especially when you wish to make a large

color reproduction from a small original.

How to use the Unsharp

Masking filter

The Unsharp Masking filter is available only when the

Advanced Control Panel is activated. Choose

UnsharpUnsharp

Unsharp

Masking Masking

Masking filter from the Filter tool in the Settings window.

Advanced Control Panel

1)1)

1) From the settings window, click the

Filter Filter

Filter tool button,

then choose

Unsharp MaskingUnsharp Masking

Unsharp Masking from the list of options.

Supplement

New “Unsharp Masking filter” Feature

Added in ScanWizard 5 Version 5.1

2)2)

2) The

Unsharp MaskingUnsharp Masking

Unsharp Masking dialog box appears.

3)3)

3) Enter a value in the

Strength Strength

Strength box to specify the degree

of the filter’s effect. The higher the value, the stronger

the effect of the filter.

4)4)

4) Select a mask size in the

Mask SizeMask Size

Mask Size box. This param-

eter determines the depth of pixels that will be affected

at the edge. Available selections are 3x3, 5x5, and 7x7.

For small, low-resolution image files,

3x33x3

3x3 is sufficient.

For high-resolution, or large-scale image files, use

7x77x7

7x7.

5)5)

5) Enter a value in the

ThresholdThreshold

Threshold box. This option allows

you to specify a tolerance range to prevent overall

sharpening that might generate noise or cause other

unexpected results. The Threshold defines the required

image of contrast between adjacent pixels before

sharpening is applied to an edge. A lower value

produces a clearer effect.

6) 6)

6) The

Light Light

Light and

DarkDark

Dark option control the sharpness

effect to be applied to the light and dark edges of the

images, respectively. In general, doing too much

Unsharp Masking on light edges would make images

seem unnatural, as the human eye is sensitive enough

to perceive them resulting changes in bright areas of

the image beyond a certain threshold. If both values

are 0, Unsharp Masking effect is disabled.

7)7)

7) Click

OK OK

OK to apply the settings.

Original

Unsharp Mask

3 x 3

Unsharp Mask

5 x 5

Windows