2013

Table Of Contents
were created outside of AutoCAD 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.
If you change contrast, fade, and monochrome values, plotted output is
affected.
Adjust Colors for Background
Adjust Colors for Background controls whether the underlay colors are visible
against the drawing background color. The default setting of Yes indicates
that the background colors of the underlay and the drawing environment are
analyzed to see if they are both light or both dark, or is one dark and the other
light. When one background is light and the other dark, the colors of the
underlay are inverted so the underlay is displayed. If the setting is changed
to No or Off, the original colors of the underlay are used. Depending on the
background colors, the underlay might not be visible.
Clip PDF Underlays
You can use a clipping boundary to clip a PDF underlay.
You can define part of an underlay that you want to display and plot by setting
up a clipping boundary with PDFCLIP, IMAGECLIP, VPCLIP, and XCLIP. The
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