Experience of Prepress Output Quality Management (1)

Despite the maturity of CTP technology, laser imagesetters still maintain their strong production. In the printed publications such as commodity packaging and books and magazines, there is still a considerable portion of the process of designing, producing, outputting, and finally printing finished products. The quality of the photo-discharge film is directly related to the quality of the final printed product. This shows that there are still many fields in the traditional process that need to be studied and explored. Here I will talk about the experience of prepress quality control from the perspective of process management.

Original quality
From the perspective of total quality management, the quality of the control photographs must be started from the manuscript. Since the quality of the manuscript determines the quality of the photographs, the manuscript must be carefully examined.
1. Check whether the surface of the original is scratched or dirty, whether the characters and lines are complete or not, and whether there is any missing or broken picture.

2. Check if the screen is color cast. Under natural light or a standard light source close to sunlight, observe whether the white, gray, black, and other achromats on the reflective document have other colors.

3. Check if the main color is accurate. In general, the colors of reflective drafts (such as photos) are slightly exaggerated than the actual scene colors, such as more vivid than the original colors. The reflection draft based on characters should be based on the ruddy face color.

4. Check if the contrast is moderate. The contrast of the reflection draft includes luminance difference, color contrast and contrast balance. With a moderate brightness difference, there will be a rich transitional color hierarchy between the high-profile part and the darker part; the color contrast is moderate, the reflection text color density is large, and it has a strong stereoscopic effect; the contrast balance is good, and the same color is in the high-profile part The color reproduction will be consistent with the dark tone.