2013

Table Of Contents
NOTE AutoCAD 2000 and later releases do not support LZW-compressed TIFF
files, with the exception of English language versions sold in the US and Canada.
If you have TIFF files that were created using LZW compression and want to insert
them into a drawing, you must resave the TIFF files with LZW compression disabled.
For information on identifying referenced images, see Highlight External
References in a Drawing in
Attach and Detach Referenced Drawings (page 644).
Access Raster Images Using the Internet
Designers and manufacturers store images of their designs or products on the
Internet. You can easily access image files from the Internet. URL image file
names are stored in the drawing.
Accessing images from the Internet saves time and provides for rapid
distribution of designs. For example, an architect who needs to show a client
what custom cabinets will look like has the manufacturer create a rendered
image of the cabinets, post it to a website, and then attach the image to the
drawing file as a URL; any design changes can be updated immediately. For
more information, see
Reference Other Drawing Files (page 643).
Scale Raster Images
You can control the size of a raster image in a drawing to match the scale of
the drawing.
You can specify the raster image scale factor when you attach the image so
that the scale of the geometry in the image matches the scale of the geometry
in the drawing. The default image scale factor is 1, and the default unit for all
images is Unitless. The image file can contain resolution information
defining the dots per inch (DPI), relating to how the image was scanned.
If an image has resolution information, the program combines this information
with the scale factor and the unit of measurement of the drawing to scale the
image in your drawing. For example, if your raster image is a scanned blueprint
on which the scale is 1 inch equals 50 feet, or 1:600, and your drawing is set
up so that 1 unit represents 1 inch, then in the Attach Image dialog box under
Scale, select Specify On-Screen. To scale the image, you clear Specify On-Screen,
and then enter 600 in Scale. The image is then attached at a scale that brings
the geometry in the image into alignment with the geometry in the drawing.
If no resolution information is defined with the attached image file, the width
of the raster image is set to one unit. Thus, when the image file is attached,
the image width in units is equal to the raster image scale factor.
684 | Chapter 11 Share Data Between Files