Method of creating proof image data, proof image data creation device, and non-transitory computer-readable storage medium storing computer program

A proof image data creation device comprising:

• a basic proof image acquisition unit that acquires basic proof image data for reproducing, by a proof output device, a color of a basic printed matter obtained by applying a basic backing to a translucent print fabric formed by printing an image on a translucent fabric by a printing machine;
• a texture information acquisition unit that acquires texture information of the translucent fabric;
• a backing color information acquisition unit that acquires a basic backing color that is a color of the basic backing and an observation backing color that is a color of an observation backing used in an observation environment of the translucent print fabric;
• a color correction unit that creates foreground color proof image data representing a color of the translucent print fabric observed without using a backing by executing color correction processing of removing the basic backing color from the color represented by the basic proof image data according to the texture information;
• and
• a synthesis unit that creates observation proof image data representing a color of an observation printed matter obtained by applying the observation backing to the translucent print fabric by executing synthesis processing of synthesizing the observation backing color with a color represented by the foreground color proof image data according to the texture information, wherein
• the synthesis unit is configured to execute processing (e1) of determining an observation color mixing ratio of the observation backing color when the color of the observation printed matter is regarded as a color mixture of the color of the translucent print fabric and the observation backing color according to the texture information and the basic proof image data, and
• processing (e2) of creating the observation proof image data by executing a calculation of synthesizing the observation backing color with the color represented by the foreground color proof image data according to the observation color mixing ratio, and
• the observation color mixing ratio is set to change depending on lightness of the basic proof image data.

A non-transitory computer-readable storage medium storing a computer program, the computer program causing a computer to execute:

• processing (a) of acquiring basic proof image data for reproducing, by a proof output device, a color of a basic printed matter obtained by applying a basic backing to a translucent print fabric formed by printing an image on a translucent fabric by a printing machine;
• processing (b) of acquiring texture information of the translucent fabric;
• processing (c) of acquiring a basic backing color that is a color of the basic backing and an observation backing color that is a color of an observation backing used in an observation environment of the translucent print fabric;
• processing (d) of creating foreground color proof image data representing a color of the translucent print fabric observed without using a backing by executing color correction processing of removing the basic backing color from a color represented by the basic proof image data according to the texture information;
• and
• processing (e) of creating observation proof image data representing a color of an observation printed matter obtained by applying the observation backing to the translucent print fabric by executing synthesis processing of synthesizing the observation backing color with a color represented by the foreground color proof image data according to the texture information, wherein
• the processing (e) includes
• processing (e1) of determining an observation color mixing ratio of the observation backing color when the color of the observation printed matter is regarded as a color mixture of the color of the translucent print fabric and the observation backing color according to the texture information and the basic proof image data, and
• processing (e2) of creating the observation proof image data by executing a calculation of synthesizing the observation backing color with the color represented by the foreground color proof image data according to the observation color mixing ratio, and
• the observation color mixing ratio is set to change depending on lightness of the basic proof image data.