Customize the colors when you want to choose which colors or patterns are used to identify the difference or status of each line in the content windows.
To customize the colors:
In the main window, select View | Configuration, or click the Configuration button: 
on the toolbar, and select the Colors tab.
Set the colors and patterns used to identify the difference and status of the various lines in the content windows.
When you have finished, click Apply to commit the changes and continue using the Configuration dialog box, or click OK to commit the changes and quit the dialog box
To determine the colors:
To locate the type of difference, use the section headed Addition, Deletion, Change, No Change, Padded, or Ancestor.
To set the Unselected color, use the left pair of buttons. This will determine the color that indicates that the line is not yet selected for the target file.
To set the Selected color, use the left pair of buttons. This will determine the color that indicates that the line has been selected for the target file.
To set a background color, click the left button of the pair.
To set a text color, click the right button of the pair.
To set a color:
Click the button corresponding to the color you want to change.
Select the required color from the color palette.
If you want to further customize the color, click the Define Custom Colors button.
Set the color either by entering values in the Hue, Sat, Lum, Red, Green and Blue fields, or dragging the arrow key in the color scroll bar. The color will be displayed in the Color|Solid box.
Click the Add to Custom Colors button: 
to add the color to Custom colors box.
When you have chosen the color, click OK. You will be returned to the Colors tab and the color of the selected button will have changed.
To set the other options on the Colors tab:
To choose the pattern for conflicts, choose a pattern from the corresponding list for Unselected, Selected, or Resolved. This pattern will appear as a background against the line.
To display the ancestor text for deleted lines in the Derivatives, click the Show Ancestor text in Derivative check box.
To restore the settings to the defaults, click the Load Merge Tool Defaults button.
Related Topics
Setting the Merge Tool Options