Printer, method for controlling quality of printing density in printer and system therefor

A method for controlling quality of printing density in a printer, comprising the steps of:

• outputting a test pattern for density measurement from said printer;
• measuring first and second density values of said test pattern for the density measurement on a built-in densitometer built into said printer and an external densitometer calibrated using a reference density sample whose density values have been measured with a densitometer calibrated in accordance with national standards;
• generating a calibration table for calibrating said first density values in said built-in densitometer based on a difference between said first and second density values obtained through said measuring step;
• storing said calibration table within said printer;
• and
• performing quality control of the printing density in the printer based on third density values obtained by calibrating said first density values in said built-in densitometer with said calibration table.

A system for controlling quality of printing density in a printer, comprising:

• a reference density sample whose density values have been measured with a densitometer calibrated in accordance with national standards;
• an external densitometer calibrated using said reference density sample;
• and
• the printer, including:
• test pattern output means for outputting a test pattern for density measurement;
• a built-in densitometer for measuring first density values of said test pattern for the density measurement;
• input means for inputting second density values of said test pattern for the density measurement obtained by measuring on said external densitometer;
• calibration table generation means for generating a calibration table for calibrating said first density values in said built-in densitometer based on said input second density values of said test pattern for the density measurement obtained by measuring on said external densitometer and said first density values of said test pattern for the density measurement obtained by measuring on said built-in densitometer;
• and
• storage means for storing said generated calibration table;
• wherein said system calibrates the first density value in said built-in densitometer by said stored calibration table.