Do I need to reset the paper to zero when measuring the color code?
No need. In the process of image copying, paper density and paper color are very important reference data, so they should be included in the density measurement process. The paper density measurement should be carried out simultaneously using four density meter filters, which are used to calculate other printing characteristics in actual operation.
Is using a density meter the only way to measure color scale?
The role of the color scale is to allow operators and other relevant personnel to measure and communicate various changes that occur during the printing process, so the density meter is not the only measurement tool. This is because when the printing press is proofing or printing a job, the most effective way for the operator to change the appearance of the image is to change the water-ink balance by controlling the ink supply system or fountain solution system. The key measurement factors that characterize the success of this control are the density value and the dot expansion amount, and the latest colorimeter and spectrophotometer can be calculated by the built-in computer to obtain the density value and dot expansion value required for the operation of the printing press. . But compared with this, the density meter is probably the most effective and lowest cost measurement color, and also the most intuitive tool.
What is the difference between the production color code, the proof color code and the GCA / GATF Proof Comparator?
From a technical point of view, these three color scales are very similar. They all have color patches that measure printing characteristics, such as solid ink density patches, dot expansion at 25%, 50%, and 75% tone values, trapping, gray balance, and ghosting. The main difference is that GCA / GATF Proof Comparator has a flesh-colored and light-colored graphic color patch, which helps to quickly identify color shifts visually. The GCA / GATF Proof Comparator and GATF proof color scales also contain 25%, 50%, and 75% overprinted color patches.
From an application perspective, these three color scales are quite different. The production color scale should be as narrow as possible (approximately one-fifth of an inch) to ensure that it can be pasted on the free space of the printing plate. The objects in the color scale are closely arranged to form a long row. The color scale for proofing will not have the above constraints and restrictions due to different uses. It is about 1.25 inches wide and contains larger-sized objects and additional control elements. The color scale for proofing is often used for proofing on a printing press. GCA / GATF Proof Comparator is specially developed to check the quality of pre-proofing proofs. GCA / GATF Proof Comparator has a width of 2.25 inches and contains all the objects in the color scale for proofing. It can detect the copying of primary colors, overprints, gray balance color blocks and graphic elements.
What is the number of screen lines and dot shape on the color scale?
Two basic principles are generally followed when choosing the number of screens for color coding:
· It is recommended that the number of screen lines on the color scale be the same as the number of screen lines used in printing operations. This is mainly because the expansion of dots will be affected by the number of screens. The higher the number of screens per inch, the greater the expansion of the dots. Using the same number of screen lines as the actual production to screen the color standard can truly reflect the operating conditions of the printing press, which is consistent with the halftone color separation method.
· It is recommended that the color code use a slightly higher number of screen lines than the printing operation. The basis of this principle is that because the number of screen lines is more refined, the color mark is more sensitive to changes in the printing process, which can reflect various changes through dot expansion and dot sharpening faster than actual production. Personnel make necessary process adjustments before the image begins to show visual changes, reducing waste.
Whether a color standard with a higher number of screens will be more sensitive to process changes, investigation and research on this issue show that this principle is theoretically correct:
The sensitivity of the number of screen lines between 133 and 150 lines per inch to error is minimal.
· When measuring the color scale, the difference between the method used and the inherent measurement difference on the equipment can cover any difference brought by the color scale plus the number of network cables.
There are currently two different views on the discussion of the shape of dots. Some people think that the color patches should use the same dot shape as the color separation film to provide the best correction. It is also suggested to use round, square and oval dots. Each shape of dot has its own advantages, and the replication difference caused by the shape of the dots is very small, and it is the same as the number of screens. The changes are much smaller than those caused by copying or copying color-coded film.
The following methods are recommended:
· Consistently using the same number of color-coded screen wires is more important than correlating color-coded screen wires with the actual number of screen wires produced. With the continuous accumulation of experience, operators, managers, etc. have begun to link objective measurements with the appearance of images. The use of color codes with different numbers of screens will hinder the understanding of these changes, introduce chaotic factors, and increase the complexity of quality control.
· When possible, you can use a color scale that matches the actual number of screens. The number of screen lines of the color scale is consistent with the number of screen lines of the dichroic film printed side by side. When measuring, it can be easily connected to each part through the visual appearance of the image, reducing the confusion caused by the difference in screen lines The smallest.
· The color mark can adopt any dot shape, as long as the dot shape is consistent on all applied films and all objects containing these color patches.
No need. In the process of image copying, paper density and paper color are very important reference data, so they should be included in the density measurement process. The paper density measurement should be carried out simultaneously using four density meter filters, which are used to calculate other printing characteristics in actual operation.
Is using a density meter the only way to measure color scale?
The role of the color scale is to allow operators and other relevant personnel to measure and communicate various changes that occur during the printing process, so the density meter is not the only measurement tool. This is because when the printing press is proofing or printing a job, the most effective way for the operator to change the appearance of the image is to change the water-ink balance by controlling the ink supply system or fountain solution system. The key measurement factors that characterize the success of this control are the density value and the dot expansion amount, and the latest colorimeter and spectrophotometer can be calculated by the built-in computer to obtain the density value and dot expansion value required for the operation of the printing press. . But compared with this, the density meter is probably the most effective and lowest cost measurement color, and also the most intuitive tool.
What is the difference between the production color code, the proof color code and the GCA / GATF Proof Comparator?
From a technical point of view, these three color scales are very similar. They all have color patches that measure printing characteristics, such as solid ink density patches, dot expansion at 25%, 50%, and 75% tone values, trapping, gray balance, and ghosting. The main difference is that GCA / GATF Proof Comparator has a flesh-colored and light-colored graphic color patch, which helps to quickly identify color shifts visually. The GCA / GATF Proof Comparator and GATF proof color scales also contain 25%, 50%, and 75% overprinted color patches.
From an application perspective, these three color scales are quite different. The production color scale should be as narrow as possible (approximately one-fifth of an inch) to ensure that it can be pasted on the free space of the printing plate. The objects in the color scale are closely arranged to form a long row. The color scale for proofing will not have the above constraints and restrictions due to different uses. It is about 1.25 inches wide and contains larger-sized objects and additional control elements. The color scale for proofing is often used for proofing on a printing press. GCA / GATF Proof Comparator is specially developed to check the quality of pre-proofing proofs. GCA / GATF Proof Comparator has a width of 2.25 inches and contains all the objects in the color scale for proofing. It can detect the copying of primary colors, overprints, gray balance color blocks and graphic elements.
What is the number of screen lines and dot shape on the color scale?
Two basic principles are generally followed when choosing the number of screens for color coding:
· It is recommended that the number of screen lines on the color scale be the same as the number of screen lines used in printing operations. This is mainly because the expansion of dots will be affected by the number of screens. The higher the number of screens per inch, the greater the expansion of the dots. Using the same number of screen lines as the actual production to screen the color standard can truly reflect the operating conditions of the printing press, which is consistent with the halftone color separation method.
· It is recommended that the color code use a slightly higher number of screen lines than the printing operation. The basis of this principle is that because the number of screen lines is more refined, the color mark is more sensitive to changes in the printing process, which can reflect various changes through dot expansion and dot sharpening faster than actual production. Personnel make necessary process adjustments before the image begins to show visual changes, reducing waste.
Whether a color standard with a higher number of screens will be more sensitive to process changes, investigation and research on this issue show that this principle is theoretically correct:
The sensitivity of the number of screen lines between 133 and 150 lines per inch to error is minimal.
· When measuring the color scale, the difference between the method used and the inherent measurement difference on the equipment can cover any difference brought by the color scale plus the number of network cables.
There are currently two different views on the discussion of the shape of dots. Some people think that the color patches should use the same dot shape as the color separation film to provide the best correction. It is also suggested to use round, square and oval dots. Each shape of dot has its own advantages, and the replication difference caused by the shape of the dots is very small, and it is the same as the number of screens. The changes are much smaller than those caused by copying or copying color-coded film.
The following methods are recommended:
· Consistently using the same number of color-coded screen wires is more important than correlating color-coded screen wires with the actual number of screen wires produced. With the continuous accumulation of experience, operators, managers, etc. have begun to link objective measurements with the appearance of images. The use of color codes with different numbers of screens will hinder the understanding of these changes, introduce chaotic factors, and increase the complexity of quality control.
· When possible, you can use a color scale that matches the actual number of screens. The number of screen lines of the color scale is consistent with the number of screen lines of the dichroic film printed side by side. When measuring, it can be easily connected to each part through the visual appearance of the image, reducing the confusion caused by the difference in screen lines The smallest.
· The color mark can adopt any dot shape, as long as the dot shape is consistent on all applied films and all objects containing these color patches.
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