Data information obtained from proofs

a. The information can be obtained from the gray ladder rule, and the normal transmission or reflection scale can be scanned normally to obtain the four-color film of gray ladder ruler C, M, Y and K, and the normal data proofing is performed on the gray scale ruler. The reflection density meter was used to measure the density of the sample pedestal at various levels and used as the curve abscissa data. The transmitted densimeter was used to measure the weak ruler gradation network data of each color version and used it as the ordinate data. Neutral gray balance data for transmission or reflection, as well as hierarchical reproduction curves for each color version. According to the state of the four curves, the Gima values ​​of the four color curves of C, M, Y, and K can be obtained respectively.
The above neutral grey balance data can be fed back to the scanner to select the appropriate curve value and set the data in the file-color setup-printing ink setup in Photoshop. At the same time, according to the state of the neutral gray curve and the proofs, the ability of the scanner used to reflect the level under normal conditions can be obtained to facilitate the adjustment of the curve to achieve the best level of performance, so that it can be targeted against different originals. Adjust the curve to assign and adjust levels.
b. Obtaining information from the proof signal control bar is generally used in Bruner's second generation or third generation signal bar. From the signal strips, the following conclusions can be drawn from the measurement and calculation of the reflection densitometer:
1. Measure the dot area of ​​25, 75 dots to get the dot gain value.
2. In the 50 coarse mesh area, the state of the dot change during the proofing can be observed through a magnifying glass. The main observations were the connection of the four vertices of the square dots, and whether the edges of the dots were deformed and made hairy or hairy.
3. In the area of ​​thin lines, it can be observed with naked eyes whether the proofing dots have backward smearing or left-right displacement. At the same time with a magnifying glass to observe how much the amount of change.
4. Use the magnifying glass to observe the small dot restore status in the small dot area. Proofing 2 small outlets should be complete under normal conditions.
5. Use the reflectance densitometer to directly measure the solid density of each color ink.
6 can be visually observed proofing neutral ash reduction status and R, G, B three color proofing oil proofing the situation.
7. Some signal strips also contain a printing plate exposure control screed. It is easy to observe whether the exposure of the printing plate is appropriate by using the exposed weak ruler.
Digital Proofing in DTP System In the DTP system, due to the continuous development of computer technology in recent years, the emergence of various color management software, and the continuous decline in prices, digital proofing has aroused more and more interest in the industry.
There are many Epson inkjet printers and Tektronix printers used in the desktop system. For these printers, they have the advantages of high resolution, vivid colors, and high printing speed. But in the strict sense, they all belong to office color printing equipment. On the one hand, the pigment used by it is far from the printing ink; on the other hand, the software used to adjust the printing color cannot really make the color printer achieve the effect of analog print.
People gradually turn their attention to high-end digital inkjet printers, hoping to use digital proofing to replace long-term and high-cost analog proofing, and to enable the printing department to accept and accept. Therefore, some color printers capable of simulating printing effects, including printers in the form of thermal sublimation, ink jet, thermal transfer, etc., have been recognized and accepted by DTP industry professionals for their advantages such as good stability, low cost, and high speed.
Digital proofing provides a standard color image file from which the film is output for printing or analog proofing. For color proofing or proof printing, a color measuring instrument is used to measure the colors of the proofs.