By default, Microsoft Publisher does not consider white a color and does not trap it in spot-color publications. However, you can trap objects filled with white by adding white as a spot-color ink.
Trap white objects as a spot color
- On the Tools menu, point to Commercial Printing Tools, and then click Color Printing.
- Click Spot colors.
- In the Inks tab, click New Ink.
- In the New Ink dialog box, click the Standard tab, and then click the white swatch in the color palette.
- Click OK twice.
- On the Tools menu, point to Commercial Printing Tools, point to Registration Settings, and then click Publication.
- Select the Automatic trapping check box.
- Under Spot color options, select the Trap white as a color check box, and then click OK.
Publisher gives the white spot color a default luminance value of 100. White objects will trap to other spot-color objects according to the threshold values you have set in the Trapping Thresholds dialog box (Tools menu, Commercial Printing Tools, Registration Settings, Publication, Thresholds).
Publisher traps the outside border of tables to background colors in the same way it traps other objects. Elements within tables
Inside cell borders Inside cell borders that are filled with a color trap to the fill color. Inside borders of cells that are transparent trap to background colors. For adjacent cells that are filled with different colors and have no border, the colors trap to each other.
Diagonal cells Publisher does not trap diagonal cell borders or fills.
Text within table cells Text in cells that are filled with a color traps to the fill color, while text in transparent cells traps to the background color.
Tables in the background When a table is in the background, Publisher does not trap overlying foreground objects by default. Using per object trapping, you can trap a foreground object to a background table using a spread. If you specify a choke or centerline trap, however, Publisher will not trap the object.
Individual objects in a table When you apply trapping to individual objects in a table, the settings apply to the entire table. For example, if you specify trapping for a border or fill in a table, it applies to all borders or fills within the table. However, you can trap text selectively within a table. For example, you can highlight the text in one cell and apply a custom spread to trap it, while in another cell, you can highlight text and apply a custom choke to trap it.