Modify Reference - Xref

When select a reference file, a contextual tab displays according to the type of reference file selected:

Drawing

You can edit the reference drawing, clipping or open the External Reference Palette

DWF

You can adjust the contrast and fade, or change DWF to monochrome; clipping, enable snap, edit layers

Image

You can adjust the brightness, contrast and fade, clipping; change the background transparency

Underlays and image references can only be selected when the frame of reference is on

 

Insert tab > Reference panel