Get the required data information from proofs

As a standard proofing proofs should contain proofing print control signal strips, if the scanner and other production software also need proofing printing...

a. Information can be obtained from the grey ladder rule. Normal scan of the standard transmission or reflection scale is performed to obtain the four-color film of gray ladder rule C, M, Y, and K, and proofing is performed according to normal data.

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 control section of the sampling signal At present, domestic use of Brunel's second generation or third generation signal strips is generally used. 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.

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