Color adjustment method of four-color printing machine:
In printing, a lithographic printing method of full-color reproduction using red, yellow and blue primary colors and black materials (ink or dye) according to the principle of subtractive blending.
Therefore, many colors cannot be printed out, and there are many limitations. But sometimes printing to achieve a certain effect, when PS printing out a few more color plates, the color to be printed in advance to be adjusted, on a few more machine to complete. Therefore, five - color printing, six - color printing.
If the yellow, magenta, blue and black four color ink color other than the original color ink to copy the printing process, should not be called "four-color printing" and should be called "color printing" or "color printing".