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Summary:
Several factors affect the quality of printed colors in lithographic offset printing. From a process control point of view, the quality of the process color of printed samples can be controlled by adjusting the ink key and dampener settings on each printing couple. In this work, we investigated the effect of these press control variables and the press speed on process color reproduction in lithographic offset printing. Since spectrophotometers and colorimeters have been widely used in the printing industry, we used a spectrophotometer to measure the color of printed samples, which is expressed as CIELAB (L*, a*, b*) triplet. The printing tests were conducted by printing GATF newspaper test forms on a Goss Universal Offset Press. We also investigated the effect of press temperature on color variations during press transient at the start-up. In addition, we also characterized the color variations of samples printed under the same printing condition. The printing tests were conducted by printing GATF newspaper test forms on a Goss Universal Offset Press. We also investigated the effect of press temperature on color variations during press transient at the start-up. In addition, we also characterized the color variations of samples printed under the same printing condition.