Data processing apparatus, image recording system, data processing method, and recording medium
A black figure specification part of a data processing apparatus specifies a black figure from among a plurality of figures in original image data that represents each figure in a vector format. When the overprint attribute of the black figure is ON, a data processing part adds a new black figure whose overprint attribute is OFF and that indicates a figure central portion of the black figure excluding an outer edge portion of a predetermined width from the edge, to the original image data. When the black figure overlaps with another figure that includes a color other than black, the density of the other color in the area where the figure central portion and the other figure overlap each other is zero in raster data for image recording. This increases the darkness of color of the black figure and reduces the appearance of white streaks around the black figure.
1. A data processing apparatus for performing processing on original image data before the original image data is converted into raster data for image recording performed by an inkjet printer, the apparatus comprising:
a black figure specification part for specifying a black figure from among a plurality of figures in original image data that represents each of said plurality of figures in a vector format; and
a data processing part for performing an update of said original image data when an overprint attribute of said black figure is ON and said black figure overlaps with another figure that includes another color other than black, wherein the update includes:
identifying a figure central portion of said black figure that is a portion excluding an outer edge portion that has a predetermined width from an edge of said black figure, said figure central portion not overlapping with said edge of said black figure, and
adding a new black figure that corresponds to said figure central portion over said black figure in said original image data, said overprint attribute of said new black figure being set to OFF.
2. The data processing apparatus according to claim 1 , wherein
said data processing part changes said overprint attribute of said black figure to ON when said overprint attribute of said black figure is OFF, and updates said original image data by adding a new black figure that indicates said figure central portion of said black figure and whose overprint attribute is OFF to said original image data.
3. The data processing apparatus according to claim 1 , further comprising:
a composed figure generation part for generating a composed figure in which a thinned figure obtained by thinning one figure among said plurality of figures and at least part of a central line of said one figure are superimposed on each other, and replacing said one figure with said composed figure,
wherein said data processing part generates said new black figure from said composed figure when said composed figure is said black figure.
4. The data processing apparatus according to claim 3 , further comprising:
a processor; and
a memory storing instructions that, when executed by said processor, cause said processor to implement said black figure specification part, said data processing part, and said composed figure generation part.
5. The data processing apparatus according to claim 1 , wherein
when a size of a black character serving as said black figure is less than or equal to a predetermined size, said new black figure includes at least part of a central line of said black character.
6. An image recording system comprising:
the data processing apparatus according to claim 1 ;
a RIP part for converting original image data processed by said data processing apparatus into raster data; and
an inkjet printer for recording an image on a base material in accordance with said raster data.
7. The image recording system according to claim 6 , wherein
in said inkjet printer, a plurality of color inks including black are sequentially ejected onto each position of said base material, and said plurality of color inks at said each position are simultaneously cured by a curing part.
8. The data processing apparatus according to claim 1 , further comprising:
a processor; and
a memory comprising instructions that, when executed by said processor, cause said processor to implement said black figure specification part and said data processing part.
9. A data processing method for performing processing on original image data before the original image data is converted into raster data for image recording performed by an inkjet printer, the method comprising:
a) specifying a black figure from among a plurality of figures in original image data that represents each of said plurality of figures in a vector format; and
b) performing an update of said original image data when an overprint attribute of said black figure is ON and said black figure overlaps with another figure that includes another color other than black,
wherein the update includes:
identifying a figure central portion of said black figure that is a portion excluding an outer edge portion that has a predetermined width from an edge of said black figure, said figure central portion not overlapping with said edge of said black figure, and
adding a new black figure that corresponds to said figure central portion over said black figure in said original image data, said overprint attribute of said new black figure being set to OFF.
10. The data processing method according to claim 9 , wherein
in said operation b), said overprint attribute of said black figure is changed to ON when said overprint attribute of said black figure is OFF, and said original image data is updated by adding a new black figure that indicates said figure central portion of said black figure and whose overprint attribute is OFF to said original image data.
11. The data processing method according to claim 9 , further comprising:
generating a composed figure in which a thinned figure obtained by thinning one figure among said plurality of figures and at least part of a central line of said one figure are superimposed on each other, and replacing said one figure with said composed figure,
wherein in said operation b), said new black figure is generated from said composed figure when said composed figure is said black figure.
12. The data processing method according to claim 9 , wherein
when a size of a black character serving as said black figure is less than or equal to a predetermined size, said new black figure includes at least part of a central line of said black character.
13. A computer-readable non-transitory recording medium that stores a program for causing a computer to perform processing on original image data before the original image data is converted into raster data for image recording performed by an inkjet printer, said program causing said computer to execute:
specifying a black figure from among a plurality of figures in original image data that represents each of said plurality of figures in a vector format; and
performing an update of said original image data when an overprint attribute of said black figure is ON and said black figure overlaps with another figure that includes another color other than black,
wherein the update includes:
identifying a figure central portion of said black figure that is a portion excluding an outer edge portion that has a predetermined width from an edge of said black figure, said figure central portion not overlapping with said edge of said black figure, and
adding a new black figure that corresponds to said figure central portion over said black figure in said original image data, said overprint attribute of said new black figure being set to OFF.