Printing apparatus, control method thereof, control program thereof, and manufacturing method of printing material

A method of manufacturing printing material which manufactures printing material by forming a printing image on a printing medium, comprising:

• generating dot data which indicates a dot formation state for each printing pixel of the printing image which is to be formed on the printing medium by performing a half-toning process with regard to image data which represents gradation values of each pixel which configures an original image;
• printing a printing image on the printing medium by forming dots at each of the printing pixels according to the dot data;
• and
• generating the dot data where the dots are regularly distributed and arranged by using a dither mask where thresholds are set for each of the printing pixels and comparing the gradation values of each of the pixels which configure the original image and the thresholds for each of the printing pixels which are set in the dither mask in a case where the gradation values which are represented by the image data are a predetermined value or less, and generating the dot data such that the degree of regularity of the dots which are distributed and arranged is reduced as the gradation values increase in a case where the gradation values which are represented by the image data exceed the predetermined value, in the half-toning process.

A control method for a printing apparatus which performs printing on a printing medium, comprising:

• generating dot data which indicates a dot formation state for each printing pixel of the printing image which is to be formed on the printing medium by performing a half-toning process with regard to image data which represents gradation values of each pixel which configures an original image;
• and
• printing a printing image on the printing medium by forming dots at each of the printing pixels according to the dot data,
• generating the dot data where the dots are regularly distributed and arranged by using a dither mask where thresholds are set for each of the printing pixels and comparing the gradation values of each of the pixels which configure the original image and the thresholds for each of the printing pixels which are set in the dither mask in a case where the gradation values which are represented by the image data are a predetermined value or less, and generating the dot data such that the degree of regularity of the dots which are distributed and arranged is reduced as the gradation values increase in a case where the gradation values which are represented by the image data exceed the predetermined value, in the half-toning process.

A control program for a printing apparatus which performs printing onto a printing medium and is provided with a printing image generating section, which generates a printing image by forming dots at each printing pixel, and a computer, by the computer functioning as a control unit, comprising:

• controlling a dot data generating section which generates dot data which indicate a dot formation state at each of the printing pixels of the printing image which is to be formed on the printing medium by performing a half-toning process with regard to image data which represents gradation values of each pixel which configures an original image and the printing image generating section so as to generate the printing image by forming dots at each of the printing pixels according to the dot data,
• wherein, in the half-toning process, generating the dot data where the dots are regularly distributed and arranged by using a dither mask where thresholds are set for each of the printing pixels and comparing the gradation values of each of the pixels which configure the original image and the thresholds for each of the printing pixels which are set in the dither mask in a case where the gradation values which are represented by the image data are a predetermined value or less, and generating the dot data such that the degree of regularity of the dots which are distributed and arranged is reduced as the gradation values are increased in a case where the gradation values which are represented by the image data exceed the predetermined value.