set the ink of card field ID 8 to srcOrReverse
Use the srcOrReverse keyword to invert the color underneath the dark-colored parts of an object.
The srcOrReverse transfer mode performs the following steps to compute the color of each pixel:
1. Each component of the color underneath the object--the number
indicating the amount of red, green, or blue--is changed to its inverse. (If the color is expressed as three integers between zero and 255--one for each of red, green, and blue--then the inverse of each component is equal to 255 minus the component's value.)
The effect is that the darker an object is, the more transparent it is to the inverted color beneath. Black parts of an object completely invert the color underneath them, and white parts are completely opaque.
For example, suppose an object's color is 45,0,255, and the color of the pixels under the object is 20,45,100. The binary equivalent of the object's color is 00101101, 00000000, 11111111 and the binary equivalent of the inverse of the color underneath is 11101011, 11010010, 10011011
11101111, 11010010, 11111111
and the object's displayed color is 239,210,255 (the decimal equivalent).