Method of color specification and, using the same, color column structure and color chart

A color column structure for displaying colors comprising:

• a cyan color specification value display column for displaying the cyan density as a numeric value from 0 to 100% with transparency as a reference;
• a magenta color specification value display column for displaying the magenta density as a numeric value from 0 to 100% with transparency as a reference;
• a yellow color specification value display column for displaying the yellow density as a numeric value from 0 to 100% with transparency as a reference;
• and
• a white color specification value display column for displaying the white density as a numeric value from 0 to 100% with transparency as a reference.

A color chart comprising:

• a hue color chart including a plurality of first color specification plates each using an X axis and a Y axis representing coordinate axes orthogonal to each other with density of two of the colors among cyan, magenta, and yellow varied in a range from 0 to 100%, and each displaying mixed colors of the two colors on an orthogonal coordinate plane of the X axis and Y axis, the plurality of first color specification plates being arranged so that original points in form of crossing points of the X axis and the Y axis of the plurality of first color specification plates are arranged along a variation of density of a remaining one color of the colors among cyan, magenta, and yellow in a range from 0 to 100%;
• and
• a value color chart including a second color specification plate that displays white as a single color with the white density varied in a range from 0 to 100% with transparency as a reference,
• wherein the color chart makes it possible to observe colors with the second color specification plate of the value color chart overlaid over each of the first color specification plates of the hue color chart.