2011

Setting Image Density
For some images, the density value and units are already stored in the image
file or correlation source. When you use the Insert An Image command to add
an image that does not have correlation information, AutoCAD Map 3D uses
the settings from the Image Defaults tab in the Raster Extension Options dialog
box.
NOTE If the image you are inserting is supported, connect to it and add it to your
map using
Data Connect (page 440). This gives you more control over styling and
other options.
You can change the density unit when you insert an image but not the density
value. You must set the default density value from the Raster Extension Options
dialog box.
■ Density — Shows the dots (or pixels) per unit for the image. If this
information was not stored with the image or the correlation source, then
AutoCAD Map 3D uses the default density from the Raster Extension
Options dialog box.
■ Units — Select the units for the density from the Units list. For example,
if your image was scanned at 300 dots per inch, then select Inch as the
density unit.
Some image formats, such as GeoTIFF, GeoSPOT, and any image with a World
file for correlation source, have density units that are in real-world coordinates.
For example, a satellite photo can be based on dots-per-mile. In this case,
select Mile as the density unit.
The density unit that you specify can vary depending on what type of image
you are inserting. The following two examples explain the difference between
inserting an image that was scanned using dots per inch, and an aerial
photo/satellite photo that was saved in real-world units.
Setting Density Units for an Image That Is Not Georeferenced
The following example shows the relationship between paper scale, density
units, and insertion scale for an image that is not georeferenced (an image
that was not saved with real-world unit data). Any image that is drawn using
a scale (such as a floor plan) and captured with a scanner will likely fall into
this category.
The image in the following example was drawn at a paper scale of 1" = 48",
scanned at 300 dots per inch, then inserted into a drawing using 300 as the
Using Other Raster Image Formats | 467