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Canon PIXMA Manuals MG2900 series Resolution
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 (2.5 cm). The higher the resolution (value), the more detail in your image; the lower the resolution (value), the less detail.
How to Set the Resolution
You can set the resolution in Resolution on the (Scanning from a Computer) tab of the Settings dialog.
Appropriate Resolution Settings
Set the resolution according to the use of the scanned image.
Item Type
Use
Color Mode
Appropriate Resolution
Color photo
Copying
(Printing)
Color
300 dpi
Creating a postcard
Color
300 dpi
Saving to a computer
Color
300 dpi
Using on a website or attaching to e-mail
Color
150 dpi
Black and white photo
Saving to a computer
Grayscale
300 dpi
Using on a website or attaching to e-mail
Grayscale
150 dpi
Text document (document or magazine)
Copying
Color, Grayscale, or Black and White
300 dpi
Attaching to e-mail
Color, Grayscale, or Black and White
150 dpi
Scanning text using OCR
Color or Grayscale
300 dpi
Important
If you double the resolution, the data size of the scanned image 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.
Note
When you will be printing the scanned image by enlarging it, scan by setting a higher resolution than the recommended one above.
All areas outside of the document will be black only. I don't know how you were getting white background.
If you want white background around your scanned image, a) stick the check (in this example) onto a white paper and scan the whole sheet. Ensure double detection is off. b) You can also do this in software, by cropping a larger area outside the scanned image.
There are many options to view the scanned image like Actual size or Fit or Fit vertically or Fit width. The same image will appear different in each case.
If you set Automatic brightness/Contrast this happens. Try manual setting. Adjust different settings and select the best suited for a particular type of drawing. The scanner takes couple of milliseconds to judge the best lighting, by then the paper has moved little. This area appears black. This is easily solvable.
Grey as you know is different shades of black. Uncompressed TIF can store this information. Compressed TIFF is not designed for this. Compressed TIFF is for blck & white only. Try JPG option. JPG can compress Color & Grey. For pure black & white chose TIFF compression.
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