UMAX 4000u 用户手册

NOTE:  Choosing the True Color RGB 36-bit setting captures more data than the 24-bit setting.  This 
means that the file sizes listed above will be larger if you scanned images using the True Color 36-bit RGB 
setting. 
 
Choosing the Best Resolution for Your Scanning Project 
 
To choose the best resolution for scanning, determine what you are going to do with the image once it is 
scanned.  Matching your scanning resolution to the image use will give you the best image for that purpose 
and will keep the file sizes to the minimum needed. 
 
Table 2. Recommended Resolutions 
Image Use 

Printing 

300 - 600* 

Viewing on the Screen 

72 

Viewing on the Web 

72 

OCR, B/W 

300 

Pre-Press 

600 - 1200 

Enlarging 1200 
• 

Depending on the resolution of your printer. 

 
Using Custom Resolution Settings 
 
You can also specify custom resolution settings that you can use when you scan.  The maximum custom 
resolution setting you can define is 2400 dpi.  To define the custom resolution settings: 
 
1.  Choose the Custom… option from the Resolution drop down menu.  The Custom Resolution window 

opens. 

 

 
2.  Enter the desired resolution setting (between 50 and 2400 dpi) in the Custom resolution #1 box. 
 
3.  Repeat step 2 to define the Custom resolution #2 and Custom resolution #3 settings. 
 
4.  Click OK.  The settings you defined appear on the Resolution setting drop down menu, under the 

Custom heading. 

 

 
The Descreen option helps eliminate the patterns that appear when you scan printed images found in 
magazines, brochures, catalogues, etc.  This is accomplished by changing the number of lines that appear in 
every inch (lines per inch) of the scanned image. 
 
The Descreen feature is unavailable when you have chosen the B/W Document, FAX, or OCR resolution 
settings. 

 

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