Image processing apparatus and method for printing and plate making, and recording medium having image processing program recorded therein for printing and plate making

An image processing apparatus for reading print data containing a plurality of objects including image objects each having one or more colors and color objects each having one color, and generating a trap graphic along a neighboring vector, which is a boundary portion between any two overlapping objects from among the plurality of objects, the boundary portion being included in a contour of one of the two overlapping objects that is disposed on top of the other object, the apparatus comprising:na sample coordinate extraction portion for extracting coordinate points in the vicinity of the neighboring vector as sample coordinate points from among all coordinate points at which the image object is rendered, wherein at least one of the two overlapping objects is an image object;a color value acquisition portion for acquiring color values representing colors at the sample coordinate points; anda TGGP determination portion for determining a position in which to generate the trap graphic with reference to the neighboring vector, based on the color values at the sample coordinate points acquired by the color value acquisition portion.

A non-transitory computer-readable recording medium having recorded therein an image processing program for use with an image processing apparatus for reading print data containing a plurality of objects including image objects each having one or more colors and color objects each having one color, and generating a trap graphic along a neighboring vector, which is a boundary portion between any two overlapping objects from among the plurality of objects, the boundary portion being included in a contour of one of the two overlapping objects that is disposed on top of the other object, the program causing the apparatus to execute the following steps:na sample coordinate extraction step for extracting coordinate points in the vicinity of the neighboring vector as sample coordinate points from among all coordinate points at which the image object is rendered, wherein at least one of the two overlapping objects is an image object;a color value acquisition step for acquiring color values representing colors at the sample coordinate points; anda TGGP determination step for determining a position in which to generate the trap graphic with reference to the neighboring vector, based on the color values at the sample coordinate points acquired by the color value acquisition step.

An image processing method for reading print data containing a plurality of objects including image objects each having one or more colors and color objects each having one color, and generating a trap graphic along a neighboring vector, which is a boundary portion between any two overlapping objects from among the plurality of objects, the boundary portion being included in a contour of one of the two overlapping objects that is disposed on top of the other object, the method comprising:na sample coordinate extraction step for extracting coordinate points in the vicinity of the neighboring vector as sample coordinate points from among all coordinate points at which the image object is rendered, wherein at least one of the two overlapping objects is an image object;a color value acquisition step for acquiring color values representing colors at the sample coordinate points; anda TGGP determination step for determining a position in which to generate the trap graphic with reference to the neighboring vector, based on the color values at the sample coordinate points acquired by the color value acquisition step.