A system and method for infrared watermarking using gray component
replacement and other color removal schemes is shown. This method
includes providing a substrate and implementing two infrared absorption
strategies, one with low infrared absorption and the other with high
infrared absorption. These two strategies are then combined in order to
form two gamuts with substantially similar shapes. This combination can
be made by blending the gamuts at areas where one of the strategies do
not meet or implementing the intersection of the two gamuts. A watermark
is then printed along with an image. The resultant image with watermark
is void of artifacts while still having a consistent watermark signal.