Patent ID: 8482802

Claim:
Screened hardcopy reproduction apparatus for applying toner to a receiver, comprising: a. a print engine for applying the toner to the receiver, wherein the print engine may not apply toner uniformly in a selected area, whereby the toner applied to the receiver has a non-uniformity; b. a controller for receiving an input pixel level and a corresponding input pixel location; c. a tone-reproduction unit for calculating an output pixel level from the input pixel level and a corresponding output pixel location from the input pixel location; d. a compensator for using a selected non-uniformity compensation function to determine a compensated pixel level responsive to the output pixel level and the output pixel location, wherein different non-uniformity compensation functions are selected for use with different selected screening patterns having different dot shapes, the non-uniformity compensation functions being adapted to compensate for any non-uniformities in the toner applied to the receiver by the print engine; and e. a screening unit for calculating a screened pixel level and a screened pixel location from the compensated pixel level, the output pixel location, and the selected screening pattern; f. wherein the print engine applies an amount of the toner corresponding to the screened pixel level and the non-uniformity to the receiver at a toner location corresponding to the screened pixel location so that the non-uniformity is compensated for.