Based on the concept of colorimetric density and artificial neural network, the one-dimension relationship between colorimetric characteristics of primary colors and printing data and the three-dimension colorimetric relationship between complex colors and primary colors were established together with the relationship between the two color spaces, output colorimetric space and input data space.

Based on the color transfer mechanism of the making equations,the color conversion can be performed by introducing the colorimetric density variables.

Optical engine is one of the key components to affect the qualities of the chroma and luminosity in LCD projectors.

The relations and differences between chromatic value and density value are explicated, and it′s especially explained that not only the ink thickness can be expressed but also color three dimensions attribute can be exclusively figured by color density.

The basic formula of four-colors ink through plenty of experiments,then test color density,liquidity,continuity and intermittence to confecting inks,confecting inks formula improved by testing result.

Proof was made with gravure test press,and the color density and glossiness of the samples were measured.