Conversion processing method, printed material production method, and printed material production system

A printed material production method of producing a printed material obtained by reproducing an object of which texture is to be reproduced on a medium from texture characteristic information of the object of which texture is to be reproduced, the printed material production method comprising:

• separating the texture characteristic information into internal scattering information and color signal information;
• using values of a modulation transfer function as the internal scattering information and the color signal information, which are separated out;
• performing conversion into ink amount information of an ink for forming a print layer obtained by reproducing texture on the medium through lookup table conversion processing, in which a value of the modulation transfer function as the internal scattering information and a value of the modulation transfer function as the color signal information are used as inputs;
• and
• producing the printed material by discharging the ink on the medium and forming the print layer based on the ink amount information.

A printed material production method of producing a printed material obtained by reproducing an object of which texture is to be reproduced on a medium from texture characteristic information of the object of which texture is to be reproduced, the printed material production method comprising:

• changing a value of a modulation transfer function that is internal scattering information and color signal information, which are included in the texture characteristic information, in an imaged RGB signal value into a signal value of a perceptual uniform color space;
• performing conversion into ink amount information of an ink for forming a print layer obtained by reproducing texture on the medium through lookup table conversion processing, using the signal value as an input value;
• and
• producing the printed material by discharging the ink on the medium and forming the print layer based on the ink amount information.

A printed material production system that produces a printed material obtained by reproducing an object of which texture is to be reproduced on a medium from texture characteristic information of the object of which texture is to be reproduced, the printed material production system comprising:

• a light scattering measuring device that acquires the texture characteristic information;
• a computer that includes a lookup table, performs lookup table conversion processing using the lookup table, and converts the texture characteristic information into ink amount information of an ink;
• and
• a print layer forming device that forms a print layer by discharging the ink on the medium based on the ink amount information to produce the printed material,
• wherein the computer
• separates the texture characteristic information acquired by the light scattering measuring device into internal scattering information and color signal information,
• uses values of a modulation transfer function as the internal scattering information and the color signal information, which are separated out, and
• performs conversion into the ink amount information of the ink for forming a print layer obtained by reproducing texture on the medium through the lookup table conversion processing, in which a value of the modulation transfer function as the internal scattering information and a value of the modulation transfer function as the color signal information are used as inputs.

A printed material production system that produces a printed material obtained by reproducing an object of which texture is to be reproduced on a medium from texture characteristic information of the object of which texture is to be reproduced, the printed material production system comprising:

• a light scattering measuring device that acquires the texture characteristic information;
• a computer that includes a lookup table, performs lookup table conversion processing using the lookup table, and converts the texture characteristic information into ink amount information of an ink;
• and
• a print layer forming device that forms a print layer by discharging the ink on the medium based on the ink amount information to produce the printed material,
• wherein the computer
• changes values of a modulation transfer function that is internal scattering information and color signal information, which are included in the texture characteristic information acquired by the light scattering measuring device, in imaged red (R), green (G), and blue (B) signal values into a signal value of a perceptual uniform color space, and
• performs conversion into the ink amount information of the ink for forming a print layer obtained by reproducing texture on the medium through the lookup table conversion processing, using the signal value as an input value.