Chapter 4. Problem Solving and Service Information

4.1 Answers for Frequently Asking Questions

  1. How do I manage large files?
  2. How do I minimize the Moire patterns?
  3. Why are my scanned image not so colorful? how can I improve it?
  4. What is the difference between optical resolution and maximun resolution?
  5. How can I choose the best resolution and scanning method?
  6. What is the difference between "Plug and Play" and "Play and Run"? Is the scanner a "Plug and Play" or "Plug and Pun" device?
  7. How can I get some more detailed information about scanner,MiraScan and other application software?


1.How do I manage large files?
A1.Scanned images, especially those scanned as color, can be very large. To reduce the large files, follow the steps:

  • Create a selection area: Always make a selection area with the portion you really need.
  • Scan at a lower resolution: It will greatly reduce the file size of the final scanned image. Scan only up to the capability of your output device.
  • Use compression: Saving a file in the TIFF compressed format can significantly reduce the file size of image, if the TIFF compression ratio is not enough, you can choose the JPEG compressed format.
    2.How do I minimize the Moire patterns?
    A2: Moire patterns, which appear as bands, checks, or stripes in the image after printing, are caused by scanning a previously halftoned image or by changing the size of a scanned image in an application. If your images have moire pattern, try the following:
  • Lower the resolution a small amount if you are scanning gray scale or color images.
  • Place one or more clear plastic sheet protectors directly on the scanner glass and place the original artwork face down on the top of the plastic sheet and the scan the image.
  • Avoid rotation if possible because some image editors can create moire problem if you rotate a halftone image.
  • Choose the option of Descreen fuction to be "Enable", then the MiraScan driver can effectively eliminate the moire pattern, please refer to the following two image.
  • Non Descreen Image Descreen Image


    3.Why are my scanned image not so colorful? how can I improve it?
    A3. Basically, the quality of scanned image depends not only on scanner but also on the gamma value of your monitor, you can improve the poor color by the following methods:

  • Adjusting the gamma value of your monitor by choosing the "Monitor Gamma" function under "Adjustment" of MiraScan. For more details, please see section 3.2.
  • Choosing the built-in color-enhancement function from the combo box of "Color Wizard", please refer to the following two images:
  • Non Color Enhancement Color Enhancement


    4.What is the difference between optical resolution and maximun resolution?
    A4:Resolution determines the level of detail recorded by the scanner. Image quality can be improved with higher resolution, but only up to certain point. after which increasing resolution can*t almost have any visible improvement to the image. Generally speaking, optical resolution is the delimitation.

  • Optical resolution is the "native" resolution of the scanner, which is determined by the optics of the scanner hardware( for example: 300 x 600dpi scanner, 300 dpi is the x-coordination resolution determined by CCD (Charge-Coupled Device) and 600 dpi is the y-coordination resolution determined by the steps of motor per second).
  • Maximun resolution is resolution enhanced through interpolated algorithm. Interpolated resolution is useful to some task (like scanning line art or enlarging small originals), on the other hand, some image produced through this type of resolution is inferior in quality and crispness to the image produced by optical resolution.
    5.How can I choose the best resolution and scanning method?
    A5: Please refer to the following table.
  • Scanning Method Scaning Resolution Purpose
    Color 72dpi~100dpi Electronic documents viewed by monitor, like homepage.
    Gray 150dpi/300dpi 300dpi/600dpi B/W Laser Printer Output
    Color 300dpi Color Inkjet Printer Output
    B/W Line Art >300dpi OCR (optical character recognition)


    6: What is the difference between "Plug and Play" and "Play and Run"? Is the scanner a "Plug and Play" or "Plug and Pun" device?
    A6: "Plug-and-Play(PnP)" is one of the most important features of the Microsoft Windows 95 system, which makes the installing of devices and peripherals easier. whenever user plugs a new PnP device the Win95 system will find the device and inform users to install the relative driver.
    "Plug and Run(PnR)" has the benefit of Plug-and-Play technology, but it doesn*t have the constraint of PnP( if user wants to enjoy the benifit of Plug-and-Play, he need a system with Plug-and-Play BIOS and configurable motherboard components, a Plug-and-Play operating system, and of course Plug-and-Play devices at the same time). However, Plug-and-Run is independent of the hardware system and operating system. Plug-and-Run is achieved by the driver and the logic circuit on the interface card of the device. The user does not need to invest on new hardware or upgrade the operating system while benefiting from the easy installation.
    Basically,our scanner support both "PnP" and "PnR" feature, our default setting is"PnR", if you want to use the "PnP" feature, you have to adjust the jumper setting of our bundled SCSI card.
    7: How can I get some more detailed information about scanner,MiraScan and other application software?
    A7:

    1. You can get the online help by clicking Help from the menu of MiraScan driver and other application software .
    2. You can use the WordViewer(for PC user) or Acrobat(for Mac user) to open the electronic files of user's manual, OCR and image editor software , but please remember to install these electronic document while you are installing them.
    3. You can connect your computer to our web site (http://www.api.com.tw/scanner) to get the latest information of our scanner and the latest driver.