Apparatus and method determining whether object specified to enable an underlying object to be seen there through is included in data to be printed, and medium having instructions for performing the method

摘要

An image processor and an image processing method which can minimize variation of color tone or density in an image after screen processing, even if semi-transparency has been specified. The image processor generates semi-transparent image data by overlaying a semi-transparent object on the PDL data to be rendered semi-transparent. Subsequently, screen processing is performed on the semi-transparent image data, by dither processing. Subsequently it is determined whether or not to define the screen processed semi-transparent image data as the image data for printing. If the result of determination is No, the halftone value of the semi-transparent object is modified to be larger than the current value.

主权项

1. An apparatus comprising:
a processor; a memory configured to store a program instructing the processor to function as:
a detection component configured to detect a semi-transparent object including opaque pixels and transparent pixels;a changing component configured to change color values of the opaque pixels of the detected semi-transparent object;an overlaying component configured to overlay the semi-transparent object whose opaque pixels have the changed color values on another object to obtain an overlaid image; anda dither process component configured to apply a dither matrix to the overlaid image, the overlaid image including pixels corresponding to the opaque pixels and pixels corresponding to the transparent pixels,wherein the pixels of the overlaid image corresponding to the opaque pixels have the changed color values, and the pixels of the overlaid image corresponding to the transparent pixels have color values that are the same as the color values of the another object.