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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.
Detach Raster Images
You can detach the reference to an image file in a drawing.
You can detach images that are no longer needed in a drawing. When you
detach an image, all instances of the image are removed from the drawing,
the image definition is purged, and the link to the image is removed. The
image file itself is not affected.
NOTE Erasing an individual instance of an image is not the same as detaching an
image. An image must be detached to remove the link from your drawing to the
image file.
Modify Raster Images and Image Boundaries
You can control the clipping boundaries and image display properties of a
raster image.
Show and Hide Raster Image Boundaries
You can control whether the clipping boundaries of a raster image are displayed
or hidden in a drawing.
You can hide image boundaries. Hiding the image boundary prevents the
boundary from being plotted or displayed. Also, hiding the image boundary
prevents you from selecting the image with the pointing device, ensuring that
the image cannot accidentally be moved or modified. However, images can
still be selected if they are not on a locked layer, for example, if the image is
part of a named selection set made with the All option. When image
boundaries are hidden, clipped images are still displayed to their specified
496 | Chapter 11 Share Data Between Files
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