To Change the Color and Transparency of a Bitonal Image

Select the image to modify.
Right-click in the drawing area. Click PROPERTIES.
In the Properties palette, to change image color, click Color.
In the Color drop-down list, select a color or click Select Color to open the Select Color dialog box. In the Select Color dialog box, specify a color. Click OK.
To change the background of the selected image to transparent, or to change the background image from transparent to opaque, select Yes or No in the Transparency list.