Aside from using the Properties palette to edit the position, scale, and rotation of a DWF underlay, you can also modify the contrast, fade, monochrome, and colors for the background of a DWF underlay.
You can also adjust the contrast, fade, monochrome, and color settings for plotted output without affecting the original DWF file and without affecting other instances of the DWF underlay in the drawing.
Changes to contrast, fade, monochrome, and colors are made in the DWF Adjust area on the Properties palette when a DWF underlay is selected.
Contrast controls the appearance of the dimmest linework that is present in the DWF underlay and works in conjunction with the Fade setting. When Contrast is set to 100, all the linework matches the intensity of the Fade value. When Contrast is set to 20, the dimmest lines are attenuated by 20 percent of the Fade value.
Fade controls how light or dark the linework displays. Higher values produce lighter linework; conversely, lower fade values produce darker linework.
Monochrome controls the color saturation of all linework while maintaining the luminance. When turned on, the linework appears in varying shades of gray starting at black if the background color luminance is 50 percent or more. If the background color luminance is less than 50 percent, then the colors are inverted, with the darkest linework displaying in white, and the lightest linework displaying in black. This inversion is used to show the underlay on the screen, but is reverted again for plotting.
Adjust Colors for Background controls whether the DWF underlay colors are visible against the drawing background color. The default setting of Yes indicates that the background colors of the DWF 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 DWF underlay are inverted so the underlay is displayed. If the setting is changed to No, the original colors of the underlay are used. Depending on the background colors, the DWF underlay might not be visible.