PDFADJUST command
Adjusts graphical properties of a PDF underlay.
                Icon:
Description
Adjusts the face, contrast and monochrome level of one or more PDF underlays attached to the current drawing.
Note: It can be easier to use the Properties panel’s Underlay
                    Section to adjust the parameters.
            Options
- Fade
 - 
                            
Sets the fade setting of the PDF underlay(s).
- 0: minimum fade: Underlay PDF is fully displayed
 - 100: maximum fade: Underlay PD is barely visible
 
 
- Contrast
 - 
                            
Sets the contrast setting of the PDF underlay(s).
- 0: minimum contrast: both dark and light elements are displayed medium gray
 - 100: maximum contrast: dark elements are displayed dark, light elements are displayed light
 
 
- Monochrome
 - Toggles the monochrome setting of the pdf underlay(s).
 
- Yes
 - Turns colors into shades of gray.
 
- No
 - Keeps the PDF as-is.