In the Printer/Plotter area, in the Name list, select a DWFx plotter configuration file. Click Properties.
In the Plotter Configuration Editor, click the Device and Document Settings tab.
Click the (+) sign to expand the Graphics node in the tree window.
Click Vector Graphics.
In the Color Depth area, select a color depth. Click OK.
In the Changes to a Printer Configuration dialog box, do one of the following:
Select Apply Changes for the Current Plot Only — to specify a one-time override of the configuration settings that is not saved to the DWF configuration file.
Select Save Changes to the Following File — to save the configuration changes to the DWF configuration file.
Click OK.
In the Browse for Plot File dialog box, navigate to the folder location you want to save. Click Save.