When an object gets a full saturation of two colors, the haloing effect, which is normal to all laser imaging, is compounded. To offset this, the I/O controller checks incoming fonts and decrease their saturations slightly in cases where unacceptable haloing would otherwise occur. For example, a green font (pure cyan with pure yellow) might be adjusted to 80% cyan and 80% yellow. This adjustment does not visually alter the color. Since font ID drives this process, bit-mapped text is ignored and will be imaged as a normal graphic. To offset haloing in graphics, you must make adjustments by hand in the source application.
This information is also applicable to the Color LaserWriter 12/660 PS printer.
This article was published in the "Information Alley": Volume II, Issue 5, Page 8