Details:
Summary:
Part I describes a color identification system for lithographic inks that is broad enough in scope to include any conceivable color and catalog all colors into a logical and orderly arrangement. By such cataloging, lithographic ink colors can be numbered in such a manner which actually is descriptive in terms of color values. The system is being presented as a DOD standardization with national and international application considerations. The system is based on international values which interpret the spectral curve of any color into a set of values as seen by an international standard observer and illuminant. In this Identification System the CIE description of color is applied as the basis for color identification. Further describes the means of applying the color value into an ink formulation and specification system for the manufacture of color matched lithographic inks. The ink formulation is based on using eight basic colors plus black and white, which, by blending in specified parts can achieve all ink colors. Part II deals with the basic objective of establishing a system of flat tint screens which are equal distant from each other as viewed by an average observer. The system will include the full range of tints. from paper white (0% tone) to solid color (100% tone), with any desired number of screened tones of the color. It describes the visual observant method of establishing the equal distant steps using numerous gray tones from white to black. From the averages of the human observations, a chart is developed which represents the relationship of screened tints described in percent of tone on a linear scale. A tone value curve is drawn between the points on the linear scale providing a means of establishing equal distant screened tones for a system ranging from 310 100 or more steps In such a screened tint scale, any two tints randomly selected will have a visual perceptible difference equal to any two other tints randomly selected that are equally spaced on the linear scale. This paper also describes the creation of a 100 step continuous growth halftone scale for the purpose of specifications and quality control. It lists the identification and cataloging of the dot, line and special effect screens established as standards by the DOD MC&G Committee. visual observant method of establishing the equal distant steps using numerous gray tones from white to black. From the averages of the human observations, a chart is developed which represents the relationship of screened tints described in percent of tone on a linear scale. A tone value curve is drawn between the points on the linear scale providing a means of establishing equal distant screened tones for a system ranging from 310 100 or more steps In such a screened tint scale, any two tints randomly selected will have a visual perceptible difference equal to any two other tints randomly selected that are equally spaced on the linear scale. This paper also describes the creation of a 100 step continuous growth halftone scale for the purpose of specifications and quality control. It lists the identification and cataloging of the dot, line and special effect screens established as standards by the DOD MC&G Committee.