Use the adMin keyword to darken the area under an object.
The ink property determines how an object's colors combine with the colors of the pixels underneath the object to determine how the object's color is displayed. When the adMin mode is used, each component of the object color--red, green, and blue--is compared with the corresponding component of the color underneath, and the minimum of each is used for the displayed color.
For example, suppose an object's color is 30,70,150, and the color of the pixels under the object is 60,40,100. If the adMin mode is used, the object's displayed color is 30,40,100.
The adMin mode can be used only on Mac OS systems. On Unix and Windows systems, objects whose ink property is set to this mode appears as though their ink were set to srcCopy.
A list of all transfer modes can be found in the transfer mode glossary page for easy reference.