Color printing is the procedure of reproduction of an image or text in color (as opposite to simpler black and white or monochrome printing). Every natural scene or color photograph can be optically and physiologically divided into three Primary Colors, red, green and blue, approximately equal quantity of these gives rise to the perception of white, and dissimilar proportions of these gives rise to the visual atmosphere of all other colors. The additive mixture of any two primary colors in roughly equal amount gives rise to the perception of a Secondary Color. For example red and green gives yellow, red and blue generate magenta (a purple hue), and green and blue yield cyan (a turquoise hue). Only yellow color is counter-intuitive. Yellow, cyan and magenta are only the “basic” secondary colors: uneven mixtures of the primaries colors give rise to perception of a lot of other colors all of which may be considered “tertiary.”

Techniques Used – While there are many techniques for reproduce images in color, special graphic methods and industrial tools are used for mass reproduction of color images on paper. In this sense, “color printing” involves reproduction methods which are suited for printing presses able of thousands or millions of impressions for publishing newspapers and magazines, cards, posters and similar mass-market items. In this kind of industrial or commercial printing, the method used to print full-color images, such as color photographs, is referred to as four-color-process or only process printing. Four inks are used in this: three secondary colors plus black color. Those ink colors are cyan, magenta and yellow; abbreviated as CMYK. Cyan can be consideration of as minus-red, magenta as minus-green, and yellow as minus-blue. These inks are translucent or transparent. Where there two such inks partly cover on the paper due to sequential printing impressions, primary color is perceived. For example, yellow (minus-blue) over printed by magenta (minus green) yields red. Where all of three inks may overlap, almost all incidence light is absorbed or subtracted .it’s near to black. It is due to this poor “subtractive” black that a divide black ink is used. The secondary or subtractive colors cyan, magenta and yellow can be measured “primary” by printers and watercolorists (whose basic inks and paints are translucent).

Two graphic techniques are necessary for making images for four-color printing. In the “pre-press” phase, original images are translated into forms that can be used on a printing press, through “color separation,” and “screening” or “half toning.” These all steps make possible the formation of printing plates that can transfer color impressions to paper on printing presses and it is based on the principles of lithography.

Author is related to Print London. He is working with that and he has knowledge of color printing business.

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