In the Revit.ini file, settings in the [Colors] section define the colors used in various areas of the software.
BackgroundColor
This setting corresponds to the background color of the drawing area that you can specify on the Graphics tab of the Options dialog.CustomColor1...CustomColor16
The CustomColor settings correspond to the 16 custom colors that you can define in the Windows Color dialog. Use these settings to predefine the custom colors. In the software, you can then assign the colors to line styles, materials, color schemes, and more.CanvasTheme
Set the theme of the canvas 0=Dark 1=LightErrorColor
This setting corresponds to the Alert color that you can specify on the Graphics tab of the Options dialog. This color is used to highlight elements related to a warning or an error.
HiliteColor
This setting corresponds to the Selection color that you can specify on the Graphics tab of the Options dialog. This color is used to display selected elements in the drawing area.
PreHiliteColor
This setting corresponds to the Pre-selection color that you can specify on the Graphics tab of the Options dialog. This color is used to display an element when you move the cursor over it in the drawing area, before you click to select it.
Examples
[Colors] BackgroundColor=16777215 HiliteColor=12401408 PreHiliteColor=12401408 ErrorColor=33023 CustomColor1=000000 CustomColor2=0000ff CustomColor3=00ffff CustomColor4=00ff00 CustomColor5=ffff00 CustomColor6=ff0000 CustomColor7=ff00ff CustomColor8=13f9e1 CustomColor9=d3adc0 CustomColor10=3abfe0 CustomColor11=8afdcf CustomColor12=7c8d98 CustomColor13=155bc6 CustomColor14=858585 CustomColor15=121eaf CustomColor16=7e4774