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Canon CS9000F scanner
CanoScan CS9000F Support
FAQs & troubleshooting

Scan Quality (Image Displayed on the Monitor) Is Poor

Content Id: 8200777400


Issue

Cause and solution

Check 1: Increase the scanning resolution

What is Resolution?

The data in the image you have scanned is a collection of dots carrying information about brightness and color. The density of these dots is called "resolution", and resolution will determine the amount of detail your image contains. The unit of resolution is dots per inch (dpi). Dpi is the number of dots per inch (2.54 cm).

The higher the resolution (value), the more detail in your image; the lower the resolution (value), the less detail.

Setting the Resolution in MP Navigator EX

In MP Navigator EX, you can specify the resolution with Scanning Resolution in the Scan Settings dialog box.

Images for Display on a Monitor

Documents to be viewed on a display should be scanned at 150 dpi, which is close to the resolution of a standard monitor.

For film, set the resolution to 600 dpi since images are enlarged approximately four times their original size when scanned.

Images for Printing

Images to be printed should be scanned at a resolution that corresponds to the resolution of the printer.

For example, if you want to print documents using a 600 dpi black and white printer, you should set the resolution to 600 dpi. For film, set to 2400 dpi since images are enlarged approximately four times their original size when scanned.

With a color printer, specifying the resolution at half the resolution of the printer should be fine. For example, if you want to print using a 600 dpi color printer, you should set the resolution to 300 dpi for documents and 1200 dpi for film. However, with a high-resolution printer, printing takes longer than usual if you set the resolution to half the resolution of the printer.

Example of Appropriate Resolution when Printing to Scale

If you print a document at twice the size both vertically and horizontally, the resolution of the document will be reduced by half. If the resolution of the original document is 300 dpi, the resolution of the enlarged document will be 150 dpi. If you print the document with a 600 dpi color printer, the lack of detail in the image may be obvious. In that case, if you scan at the Scanning Resolution of 600 dpi, the resolution will be 300 dpi even if you double the size of document and you can print the document with sufficient quality. Conversely, if you print a document at half scale, it should be sufficient to scan at half the resolution.

When Printing Color Photos at Twice the Size

Document resolution: 300 dpi
Scanning resolution: 600 dpi
Scale: 200%
Print at twice the size
Scanning resolution/actual scanning resolution: 600 dpi
Printing resolution: 300 dpi

When Printing Color Film at L Size

Document resolution: 300 dpi
Scanning resolution: 1200 dpi
Scale: 400%
Print at four times the size
Scanning resolution/actual scanning resolution: 1200 dpi
Printing resolution: 300 dpi

Setting the Resolution in ScanGear (Scanner Driver)

In ScanGear, you can specify the resolution with Output Resolution in Output Settings on the Advanced Mode tab.

Example of Appropriate Resolution when Printing to Scale

The scanning resolution is automatically set so that the value set in Output Resolution will be the resolution of the scanned image. If you set Output Resolution to 300 dpi and scan at twice the size, the document will be automatically scanned at 600 dpi, and the resolution of the scanned image will be 300 dpi. You can print the document with sufficient quality using a 600 dpi color printer.

When Printing L Size (8.9 cm x 12.7 cm) Photos at Twice the Size

Document resolution: 300 dpi
Output resolution: 300 dpi
Scale: 200%
Scan at twice the size
Actual scanning resolution: 600 dpi
Image resolution/printing resolution: 300 dpi

When Printing 35 mm Color Film (2.4 cm x 3.6 cm) at L Size (8.9 cm x 12.7 cm)

Document resolution: 300 dpi
Output resolution: 300 dpi
Scale: 400%
Scan at four times the size
Actual scanning resolution: 1200 dpi
Image resolution/printing resolution: 300 dpi

Appropriate Resolution Settings

Set the resolution according to the use of the scanned image.

Caution

Although you can change Output Resolution in ScanGear, it is recommended that you scan at the default value.

For displaying on a monitor: 150 dpi

For printing: 300 dpi

When Output Size is set to Flexible in ScanGear's Advanced Mode tab (scale is 100%)

DocumentUseColor ModeOutput Resolution
FilmCopying
(Printing)
Color1200 dpi
Color photoCopying
(Printing)
Color300 dpi
Creating a postcardColor300 dpi
Saving to a computerColor75 dpi-300 dpi
Using on a website or attaching to e-mailColor75 dpi-150 dpi
Black and white photoSaving to a computerGrayscale75 dpi-300 dpi
Using on a website or attaching to e-mailGrayscale75 dpi-150 dpi
Text documentCopyingColor, Grayscale or Black and White300 dpi
Attaching to e-mailColor, Grayscale or Black and White150 dpi
Scanning text using OCRColor or Grayscale300 dpi-400 dpi

Caution

If you double the resolution, the file size quadruples. If the file is too large, the processing speed will slow down significantly, and you will experience inconvenience such as lack of memory. Set the minimum required resolution according to the use of the image.

Resolution

Cause and solution

Check 2: Set the scale to 100%

Some applications do not display images clearly if the image is too small.

Cause and solution

Check 3: Update the calibration data

Recalibrate the scanner from the Scanner tab in the Preferences dialog box of ScanGear (scanner driver). Calibration may take time depending on your computer.

Cause and solution

Check 4: If moire (stripe pattern) appears, take the following measures and scan again

On the Basic Mode tab of ScanGear, select Magazine(Color) in Select Source.
On the Advanced Mode tab of ScanGear, set Descreen in Image Settings to ON.

-⋗ [ Image Settings ]

Caution

If moire appears when you scan a digital print photo, take the above measures and scan again.

Cause and solution

If you use MP Navigator EX, set Document Type to Magazine(Color) or enable Descreen in the Scan Settings dialog box and scan again.

Cause and solution

Check 5: Check the monitor's color depth

Windows 7:

From the Start menu, select Control Panel ⋗ Appearance and Personalization ⋗ Adjust screen resolution ⋗ Preferences.

On the Monitor tab of the displayed dialog box, set Colors to High Color (16 bit), True Color (24 bit) or True Color (32 bit).

Windows Vista:

From the Start menu, select Control Panel ⋗ Appearance and Personalization ⋗ Adjust screen resolution to open the Display Settings dialog box. Set the color depth to Medium (16 bit) or Highest (32 bit).

Windows XP:

From the Start menu, select Control Panel ⋗ Display to open the Display Properties dialog box. On the Settings tab, set Colors to Medium (16 bit) or Highest (32 bit).

Windows 2000:

From the Start menu, select Settings ⋗ Control Panel ⋗ Display to open the Display Properties dialog box. On the Settings tab, set Colors to High Color (16 bit) or True Color (32 bit).

Macintosh:

In the System Preferences screen, click the Displays icon, then in the Colors of the Display tab, select Thousands or Millions.

Cause and solution

Check 6: Clean the Platen and Document Cover

Clean the Platen of the scanner or the light source of the Film Adapter Unit, taking special care not to press strongly on the Platen.

Cause and solution

Check 7: If the document is in poor condition (dirty, faded, etc.), use Reduce Dust and Scratches, Fading Correction, Grain Correction, etc. in Image Settings on the Advanced Mode tab of ScanGear

Caution

Do not apply these functions to images without moire, dust/scratches or faded colors. The color tone may be adversely affected.
Image correction results may not be reflected in the preview image.

Caution

Selectable settings depend on color mode settings.
Scanning may take longer when you use Image Settings.

Image Settings allows you to set the following items:

Caution

The setting items vary depending on whether Select Source is Platen or film.

Image Adjustment

When Image Adjustment is set, the brightness of the specified portion of the image is optimized. Images can be adjusted according to the automatically detected document type or the specified document type. The result of the adjustment will be reflected in the entire image.

None

Image Adjustment will not be applied.

Auto

Applies Image Adjustment by automatically detecting the document type. It is recommended that you normally select this setting.

Photo

Applies Image Adjustment suitable for photos and film.

Magazine

Applies Image Adjustment suitable for magazines.

Newspaper

Applies Image Adjustment suitable for newspapers.

Document

Applies Image Adjustment suitable for text documents.

Caution

You can set Image Adjustment after preview.
You can set this setting when Recommended is selected on the Color Settings tab of the Preferences dialog box.

Caution

Only Photo and None are available when Select Source is film.
If the image is not adjusted properly with Auto, specify the document type.
The color tone may change from the source image due to the Image Adjustment. In that case, set Image Adjustment to None.

Unsharp Mask

When this is set to ON, the outline of the subjects is emphasized to sharpen the image.

Descreen

Printed photos and pictures are displayed as a collection of fine dots. "Moire" is a phenomenon where uneven gradation or a stripe pattern appears when such photos or pictures printed with fine dots are scanned. Descreen is the function for reducing this moire effect.

Caution

Even if Descreen is set to ON, some moire effects may remain if Unsharp Mask is set to ON. In that case, set Unsharp Mask to OFF.
Selecting Magazine(Color) in Select Source in Basic Mode tab has the same effect as setting Descreen to ON in Advanced Mode tab.

Reduce Dust and Scratches

Scanned photos may contain white dots caused by dust or scratches. Use this function to reduce such noise.

None

Dust and scratches will not be reduced.

Low

Select this to reduce small dust particles and scratches. Large ones may remain.

Medium

It is recommended that you normally select this setting.

High

Select this to reduce small/large dust particles and scratches. Evidence of the reduction process may remain and may also remove delicate parts of the image.

Caution

This function may not be effective for some types of photos.

Caution

It is recommended that you select None when scanning printed materials.

Remove Dust and Scratches (FARE) (Film only)

Removes dust and scratches automatically when scanning film.

None

Dust and scratches will not be removed.

Low

Select this to remove major dust and scratches. Large ones may remain.

Standard

It is recommended that you normally select this setting.

High

Select this to remove minor dust and scratches as well. Evidence of the removal process may remain when large dust and scratches are removed.

Caution

This setting is not available when scanning black and white film.
Dust and scratches may not be removed if the scan area is too small or if they are in the top/bottom edges of the image.

Caution

When the resolution is set to 4801 dpi or higher and the Remove Dust and Scratches (FARE) checkbox is selected, scanning takes longer than usual. Also, make sure that there is sufficient free hard disk space before scanning.

Fading Correction

Use this function to correct photos and film that have faded with time or have a colorcast. Colorcast is a phenomenon where a specific color affects the entire picture due to the weather or ambient strong colors.

None

Fading correction will not be applied.

Low

Select this to correct a small amount of fading and colorcast.

Medium

It is recommended that you normally select this setting.

High

Select this to correct a large amount of fading and colorcast. This can affect the tone of the image.

Caution

You can set Fading Correction after preview.
You can set this setting when Recommended is selected on the Color Settings tab of the Preferences dialog box.
Fading Correction may not be effective if the scan area is too small.

Grain Correction

Use this function to reduce graininess (roughness) in photos taken with high-speed or sensitized film.

None

Graininess will not be reduced.

Low

Select this when the photo is slightly grainy.

Medium

It is recommended that you normally select this setting.

High

Select this when the photo is very grainy. This can affect the gradation and sharpness of the image.

Caution

Grain Correction may not be effective if the scan area is too small.

Backlight Correction

Use this function to correct photos and film that have been shot against light.

When you change the Backlight Correction setting, the result will be reflected in the preview image.

None

Backlight correction will not be applied.

Low

Select this to correct slightly backlit photos. This will not affect the image contrast.

Medium

It is recommended that you normally select this setting.

High

Select this to correct strongly backlit photos. This can affect the image contrast.

Caution

You can set Backlight Correction after preview.
You can set this setting when Recommended is selected on the Color Settings tab of the Preferences dialog box.
This setting is not available when the Enable Large Image Scans checkbox is selected on the Scan tab of the Preferences dialog box.
Backlight Correction may not be effective if the scan area is too small.

Caution

Noise patterns may appear when Backlight Correction is applied. Applying Grain Correction and setting Unsharp Mask to OFF may reduce the noise patterns.

Gutter Shadow Correction

Use this function to correct shadows that appear between pages when scanning open booklets.

When you set the Gutter Shadow Correction setting in the preview image, the result will be reflected. Preview the effects before scanning, as results vary depending on the type of document and how it is pressed.

Unclear or blurred text/lines caused by curved pages are not corrected.

None

Gutter shadow will not be corrected.

Low

Select this when the effect level is too strong with the medium setting.

Medium

It is recommended that you normally select this setting.

High

Select this when the effect level is too weak with the medium setting.

Caution

Do not place items that weigh 4.4 lbs (2.0 kg) or more on the Platen. Also, do not press on the document with a force exceeding 4.4 lbs (2.0 kg). If you press heavily, the scanner may not work correctly or you might break the glass.
Align the document with the edge of the Platen. If not, the shadow will not be corrected properly.

Shadows may not be corrected properly depending on the document. If the page background is not white, shadows may not be detected correctly or may not be detected at all.
While scanning, press down on the spine with the same amount of pressure you used to preview the scan. If the binding part is not even, the shadow will not be corrected properly.

How to place the document depends on your model and the document to be scanned.

Caution

Cover the document with black cloth if white spots, streaks, or colored patterns appear in scan results due to ambient light entering between the document and the Platen.
If the shadow is not corrected properly, adjust the cropping frame on the preview image.

Exposure/Tone Settings (Film only)

Manual Exposure

This function enables you to adjust the exposure data according to the film.

When this checkbox is not selected, the optimal exposure data (the exposure level for each RGB channel and compensation levels) is automatically set according to the color density of the portion within the cropping area of the film.

Select this checkbox if you intend to adjust the image using an application after it is scanned or to scan with an under-exposed or over-exposed effect.

After you select this checkbox, you can adjust the exposure in 1% increments within the range of 50% to 200%.

Caution

This setting is not available when Apply the tone value to all frames / Apply the tone value to all crops is applied.

Caution

Manual Exposure is not available in Basic Mode. To change exposure, select the Manual Exposure checkbox in Advanced Mode tab, then adjust the value and scan.
When this checkbox is not selected, the time required for scanning varies by film since the exposure is automatically optimized according to the film.

Apply the tone value to all frames / Apply the tone value to all crops

"All frames" is displayed in thumbnail view, and "All crops" is displayed in whole image view.

Click Apply to reflect the color adjustment data of the selected film frame or the portion within the selected cropping frame into other frames. This color adjustment data will be used in subsequent scans. It will remain in effect until you click Reset.

This is useful when you want to scan film of photos taken on the same day in the same place, in a consistent color tone.

High Quality

Set to ON to improve the image quality and reduce noise when scanning film.

Caution

Image quality may not change depending on the film type.
This setting is not available when Apply the tone value to all frames / Apply the tone value to all crops is applied.
Image Settings

Cause and solution

Check 8: If the color tone of images is different from the original document, take the following measures and scan again

On the Advanced Mode tab of ScanGear, set Image Adjustment in Image Settings to None.

-⋗ [ Image Settings ]

On the Color Settings tab in the Preferences dialog box of ScanGear, set Color Matching.

Cause and solution

Check 9: Cover the machine with black cloth if white spots, streaks, or colored patterns appear in scan results due to interference from ambient light

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