2013

Table Of Contents
Object snapping to PDF underlays is similar to object snapping to drawing
geometry. However, object snapping might not behave as expected, depending
on how the PDF was created. For example, if the PDF was made from scanned
architectural plans, the PDF is a raster image, not a vector-based image.
Therefore, object snapping does not work. Also, geometry from PDFs that
were created outside of AutoCAD LT may contain nonstandard snapping
points, such as circles with no center points.
Use the PDFOSNAP and UOSNAP system variables to turn object snapping on
and off.
Object snapping can also be turned on and off by a shortcut menu. Select an
underlay and right-click to display the object snap menu option.
Adjust PDF Underlay Contrast, Fade, Monochrome,
and Colors for the Background
You can modify the contrast, fade, and monochrome settings of a PDF
underlay. Also, so that the underlay is visible, you can adjust the underlay
colors based on the current background color of the drawing window.
Adjusting these settings does not alter the original file and does not affect
other instances of the underlay in the drawing. You can change the contrast,
fade, monochrome, and colors in the Properties Inspector or on the PDF
Underlay visor when an underlay is selected. You can also use the PDFADJUST
command.
486 | Chapter 11 Share Data Between Files