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Set Image Scale

Choose a resolution for the image

 

The Set Image Scale item lets you choose how many pixels per inch (or centimeter) are displayed for the image. For scanned images, this is usually set to match the original resolution of the drawing when it was scanned. Note that this only affects the display of the image, and can be changed at any time.

After choosing this command, the dialog shown in the following figure appears.

Use this dialog to determine the displayed size of the image

 

Use the Set snap grid to snap to nearest pixel of image option to force all lines and arcs to begin and end on a pixel in the bitmap. This makes the lines and arcs exactly meet, rather than being slightly off.

 

Some Typical Resolutions

Following are some typical resolutions that are used for scanning and images. If you are not sure of a file's resolution, try some of these choices to see which one works best.

72 pixels per inch	28 pixels per cm	Typical screen resolution
75 pixels per inch	29.5 pixels per cm	Resolution used for "Draft" printing mode
150 pixels per inch	59 pixels per cm	Also sometimes used for "Draft" printing
200 pixels per inch	78.7 pixels per cm	Typical Fax resolution
300 pixels per inch	118 pixels per cm	Common scanner and printer resolution
600 pixels per inch	236 pixels per cm	High-end scanner and printer resolution

(Metric values are approximate and given for comparison purposes only.)

 

Resolutions higher than 600 tend to be multiples of 600 (1200, 2400, and so forth).

Also note that a bitmap scanned at 600 pixels per inch is not twice as detailed as a 300 pixel per inch scan. It is actually four times as detailed (because there are 36,000 pixels per square inch as opposed to 9,000 pixels per square inch).

 

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