Canon MultiPASS MP390 MultiPASS MP390 Software Guide - Page 107

Determining resolution, Output Resolution] in ScanGear MP.

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Determining resolution You can specify a resolution in [Image quality] in the MP Toolbox settings dialog box, or in [Output Resolution] in ScanGear MP. NOTE • 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 "dpi" (dots per inch) refers to the number of dots in one inch. Resolution will determine the amount of detail your image contains. The higher the resolution (number), the more detail in your image; the lower the resolution (number), the less detail. • As a general rule, you should select a scanning resolution that corresponds to your final output device such as a monitor or printer. Images for display on a monitor Images for display on a monitor should in general be scanned at a resolution of 75 dpi. Images for printing Images to be printed should be scanned at a resolution which corresponds to the resolution of the printer. For example, if you are using a 600 dpi black and white printer, you should scan your document at [600 dpi]. NOTE With a color printer, the colors are expressed as a certain percentage of ink pigment so scanning your document at half the resolution of the printer should be fine. For example, if you are using a 600 dpi color printer, you should scan your document at [300 dpi]. Printing to scale For example, if you want to print a document which is twice the size both vertically and horizontally, the resolution of your 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 such a case, if you scan at a resolution of 600 dpi, resolution will be 300 dpi even if you double the size of the document and you can print the document with sufficient quality. Conversely, if you want to print a document at a reduced size, it should be sufficient to scan at half the resolution. Resolution and data size If you double the resolution, the image data will be four times greater. If the data is too large, processing speed will slow down significantly, and you may experience malfunctions such as lack of memory. Make sure the resolution corresponds to the purpose of use of the image and set at the lowest level possible. 105

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105
Determining resolution
You can specify a resolution in [Image quality] in the MP Toolbox settings dialog box, or in
[Output Resolution] in ScanGear MP.
NOTE
• 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 "dpi" (dots per inch) refers to the number of dots
in one inch. Resolution will determine the amount of detail your image contains. The higher the resolution
(number), the more detail in your image; the lower the resolution (number), the less detail.
• As a general rule, you should select a scanning resolution that corresponds to your final output device such
as a monitor or printer.
Images for display on a monitor
Images for display on a monitor should in general be scanned at a resolution of 75 dpi.
Images for printing
Images to be printed should be scanned at a resolution which corresponds to the resolution of the
printer. For example, if you are using a 600 dpi black and white printer, you should scan your
document at [600 dpi].
NOTE
With a color printer, the colors are expressed as a certain percentage of ink pigment so scanning your
document at half the resolution of the printer should be fine. For example, if you are using a 600 dpi color
printer, you should scan your document at [300 dpi].
Printing to scale
For example, if you want to print a document which is twice the size both vertically and
horizontally, the resolution of your 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 such
a case, if you scan at a resolution of 600 dpi, resolution will be 300 dpi even if you double the size
of the document and you can print the document with sufficient quality. Conversely, if you want
to print a document at a reduced size, it should be sufficient to scan at half the resolution.
Resolution and data size
If you double the resolution, the image data will be four times greater. If the data is too large,
processing speed will slow down significantly, and you may experience malfunctions such as lack
of memory. Make sure the resolution corresponds to the purpose of use of the image and set at the
lowest level possible.