Making standard data of the hottest scan

2022-08-07
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Production of scanning standard data

at present, the scanning resolution is 5000dpi platform scanner as the mainstream product. How to make the scanner correctly reflect the gradation and color is a puzzle for many professional printing units

after 1995, the electric extension was gradually discontinued. After 2000, the prepress field has all adopted roller scanners and platform scanners, and the ideas and means of color management are more detailed, rich, simple and easy to use. The random color management software provided by the manufacturer is made in its specific environment, which is quite different from the actual situation of domestic enterprises. Therefore, before the formal scanning, the data must be confirmed or the color management data of the unit must be established to ensure the scanning quality

I. the reverse film is the original for professional plate making (digital photos should be the mainstream in the future), while the utilization rate of the domestic reverse film is no more than 30%, and the quality of the original is very general. However, most of the high-end albums have adopted the reverse film, and the more common ones are: 30 × 24mm,60 × 70mm,60 × 90mm, mainly Kodak, with a maximum density of more than 3.50, bright colors, fine particles, rich layers and high definition. The originals used to make standard data are expensive and will be inferior over time

steps for making standard data of inversion film:

1. Select an internationally recognized special standard manuscript, including neutral gray scale, standard color bar and colorful color map

2. Neutral gray selects random data, and the color calibration data is placed in the initial state. Carry out high light and dark calibration on the neutral gray scale, with a scanning resolution of 350dpi and an output resolution of less than 3000dpi, add 175dpi, and conduct proofing after scanning (digital proofing or ink proofing)

3. Compare the proofing sample with the standard original, and fine tune it several times until the gray balance between the two is very close visually

4. After the gray balance data is confirmed, fix the proportion of high light and dark setting punctuation points. At this time, scan the standard color bar, and attach several different types of originals (people, food, scenery, utensils, metal products, etc.) to the disk for proofing

5. The adjustment of color correction shall not only compare the color bars, but also compare different types of originals. The primary color, secondary color and composite color shall be comprehensively observed and proofed repeatedly until they are close

6. Grey balance of standard data and adjustment of color calibration: on the one hand, it should be controlled by data, on the other hand, it should be judged by vision, because the quality evaluation of printed matter is finally recognized by people

7. Only when the color management data meeting the printing suitability of the enterprise can we produce qualified and high-quality printing products

II. Data production of photos

although photos are not ideal plate making originals, their utilization rate is more than 30%. The maximum density is about 2.0, which is characterized by bright colors, rough particles, small layer changes and general definition

steps for making photo standard data:

1. Select an internationally recognized special standard manuscript, including: neutral gray scale, standard color bar and colorful color map

2. Other steps are the same as those for reversing the standard data of the film

III. standard data for making drawings

there are various paper bases for drawings, which are characterized by thick fibers and strong ink absorption capacity. Most of the pigments used belong to minerals, with thick and stable colors, and excessive moderation and no contrast. The maximum density is about 1.50, and the normal mold closing and mold closing speed strokes and heavy color paintings are adjusted according to the division of labor. The utilization rate is below 10%

steps for making standard data of drawings:

1. Select standard data of photos to scan and proofing

2. Adjust the gradient curve and proofing. Compare grey balance and gradation. Select different types of originals (people, food, scenery, utensils, metal products, etc.) to save for proofing

3. Adjust the color calibration curve and compare the color calibration of different types of originals, and repeat several times until they are close

4. The critical effect value should be paid special attention not to be too strong

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IV. steps for making standard data of printed matter

printed matter is the most unsatisfactory manuscript, with a utilization rate of more than 40%, easy to produce moire, dirty color, rough particles, few changes in hierarchy, poor definition, and a maximum density of less than 2.0

steps for making standard data of printed matter:

1. Select standard data of photos to scan and proofing

2. Adjust the gradient curve and proofing. Compare grey balance and gradation. Select several different types of originals (people, food, scenery, utensils, metal products, etc.) and save them for proofing

3. Adjust the color calibration curve and compare the color calibration of different types of originals, and repeat several times until they are close. Although the supplier is eager to

4, the critical effect value should be paid special attention not to be too strong

v. making black-and-white binary, also known as line drawing, has only contrast and no hierarchy, and is mostly used for words and signs. Select set up file TIFF line work, scan mode (format) line draft reflection, resolution of 1200dpi-2400dpi, and smoothness of 0-100 for visual judgment

VI. steps for making gray scale standard data

gray scale image is a monochrome and hierarchical image, such as black-and-white photos. Set up file grey scale Descreen Print C The TIFF GR water leakage test is to inject 1/5 volume of clean water ey scale into the plastic bag with a resolution of 300dpi, and adjust the contrast and level in Photoshop as required

VII. Steps for making standard data of physical objects

physical objects with a thickness of no more than 5cm can be prevented from scanning on the glass. Select the physical object icon under scan type, and set up file and format are not selected

VIII. Steps to create copy dot% standard data

ctp process implementation foundation: must have digital proofing and copy dot% When foreign films are put together in a large version, it is inevitable that they will be out of line, dirty, folded, handmade and wrong version. Copy dot% refers to the output or full page transfer of data after scanning various films

put the positive or negative image on the platform, select Copy dot% SP, set up:xxx for scanning, and check whether the film linearity - scanning linearity - Phototypesetting linearity are consistent. It can only be used after testing

source: Beijing printing information station

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