Abstract: A pixel matrix preferably containing nine pixels is analyzed to determine whether or not all of the image values for the pixels in the pixel matrix correspond to a full saturation level. If the image values do correspond to full saturation level, preferably the center pixel is produced using a variably reduced toner output. If all of the image values do not correspond to full saturation level, the center pixel is produced using conventional methods. The system of the preferred embodiment is comprised of an input buffer for storing the image values, a comparator for comparing the image values with a toner modification value to determine if the pixel or pixels should be produced using a variably reduced toner output. The pixels are then preferably stored temporarily in an output buffer and then sent to a memory to be produced.

Abstract: A system for correcting an output device for the effects of reflected ambient illumination comprises a reflection device of known reflectivity. The color display memory stores a first graphical interface and a second graphical interface. The first graphical interface displays a range of intensities of outputs that the display device can generate. The second graphical interface displays a range of hues that the display device can generate. The reflection device has a target surface which defines an aperture. The ambient light reflecting from the target surface is compared to the first graphical interface and to the second graphical interface by viewing the interfaces through the aperture.