A method and system for jointly designing at least two sets of dither
matrices. First, a mosaic color tile is generated for a first
concentration level according to a design tile map. The mosaic color tile
includes at least a first color tile and a second color tile where each
color tile has a color tile concentration level (CTCL) and a color tile
number (CTN). Second, a color fluctuation metric is performed on the
mosaic color tile. Next, the pixels in the first color tile are modified
by an operation (e.g., a swap operation) while maintaining the first
concentration level. Then, a color fluctuation metric is re-calculated on
the mosaic color tile with all first color tiles being replaced with the
modified first color tile (i.e., everywhere the first color tile appears
in the mosaic color tile as specified by the design tile map). Performing
the step of modifying the color tiles and re-calculating the color
fluctuation metric for the modified mosaic tile until the metric is below
a predetermined metric level.
