Advanced Electronic Color Separator Theory Knowledge Appraisal Sample Questions
I. Ambient questions (1 point for every space, total 20 points)
1. The color separation sheet can be obtained with an electronic color separation machine, a plate making ___, and a color __.
2. The electronic color separation machine consists of __, __, and __.
3. Because of the external light radiation, it acts on the eyes of the person and thus produces a __ feeling. Therefore, the color of the object is determined by the ___ stimulus of the outside world, and is determined by the __ characteristics of the human eye.
4. The formula for the reflection optical density is __, and the reflection density of the yellow ink is determined using a ____ color filter.
5. When observing the printed matter, the light source and the printed surface __, the angle of observation and the surface normal of the printed product become __ included angle.
6. There are __, __, __, surface efficiency, etc. that affect paper tone and color reproduction.
7. The quality check of the color separation film includes gradation correction, ___, image clarity, ___, layout cleanliness, __, and the like.
8. The shaded part of the color subprint relies on the dot __ to reproduce the color; under the red light, the blue print is observed and the __ color is seen.
Second, multiple-choice questions (4 points for each question, a total of 20 points. Each question can only choose one correct answer, multi-choice answers to the wrong score)
1. When the color separation sheet is developed, the developer in the developer is ().
A. Accelerator B. Reducing agent C. Oxidizer D. Inhibitors
2. For a reader with a visual acuity of 1.0, within the distance of visual sight, the dot line number of () should be selected for printing.
A. 34 lines/cm B. 48 lines/cm C. 80 lines/cm D. 60 lines/cm
3. A color absorbs light having a wavelength of 500 to 600 nm and reflects light having a wavelength of 400 to 500 nm and 600 to 700 nm, and the color is a () color.
A. Green B. Magenta C. Red D. Qing E. yellow
4. For color image prints, the quality of the bulk prints must be guaranteed and must be controlled ().
A. Solid density B. Paper whiteness C. Printing sequence D. Dot gain value
5. The gravure grid acts as a ().
A. Reproduce the level of the original image B. Support scraping force C. Reproduce the color of the manuscript D. Quantitative ink supply
Three, calculation questions (10 points)
The dot coverage on the original was 75%, and the dot density at the 75% corresponding to the original was measured to be 0.85, and the spot density was 1.5. The dot gain and relative contrast were calculated.
Four, short answer questions (10 points for each question, a total of 30 points)
1. Write the following definitions of printing technology terms: print copy characteristics, color scales, density ranges, and measurement and control strips.
2. What is the difference between laser screening and screen screening in electronic color separation?
3. Why neutral grey balance in color reproduction?
V. Narrative questions (20 points)
Describe the impact of the printability of paper, ink, printing plates, ink rollers, and rubber markets on print quality.
Test sample answers
First, fill in the blank
1. Camera Desktop Publishing System
2. Scanning unit recording unit color ratio computer
3. Color physical vision
4. D=lg1/R blue
5. Vertical 45°
6. Whiteness Smoothness Ink absorption
7. Color correction size specification image positive and negative
8. Stacked black
Second, multiple choice
1. B 2. D 3. B 4. D 5.B
Three, calculation questions
Solution: FD=1-10-DR/1-10-DV×100%=1-10-0.85/1-10-1.5×100%=87%
Dot gain value: 2D=FD-FF=87 %-75%=12%
Relative contrast: K=DV-DR/DV=1.5-0.85/1.5=0.43
Fourth, short answer questions
1. A: Print copy characteristic curve: a curve that describes the relationship between the density of the original to the printed copy of each copy or dot.
Color mark: The standard of basic colors and mixed colors expressed by solid blocks and/or mesh toning blocks; it can also be used as a mark of each color separation plate when printing.
Density range: The range between the minimum and maximum density in the picture.
Measure and control strip: A strip of soft strips consisting of dots, fields, lines, etc. to determine and control the transfer of information during copying, printing, proofing, and printing.
2. A: There are the following differences:
(1) Number of screen lines: The number of lines added to the screening screen will be the same when changing the screen angle, while the screen angle of the electronic laser screen will be different from that of the screen screen.
(2) Dot shape: The dot shape of the screening screen depends on the screen characteristics such as square points, dots, chain points, etc. The edges of the screen dots are smooth. Electron laser screening a network of dots can be combined by hundreds of exposure, its shape is arranged in a multi-grid structure, the dot edge is tooth-shaped and not smooth;
(3) Screen dot screen dot density is gradually decreasing from the center to the edge line, and there is a transition zone at the edge of the dot dot. The quality of the small dot dot is not high enough; the density of the dot center and the edge of the electron laser dot screen is uniform, so the dot point definition is high. Even 1% of outlets are clear.
3. A: The gray balance is the basis for color reproduction, because from the principle of color rendering, all the colors on the printed material are the three primary colors of pigment: yellow, magenta, cyan, and their mixed colors. The three primary colors of light are red, green, and blue. Absorption, reflection formed. Absorption of the three primary colors of the color light is black, and the three primary colors of the totally reflected color light are white, and neutral gray and color of different gray levels appear in the transition band from white to black. In the case of color reproduction, if the gray balance is not reached, color and gradation reproduction will be seriously deviated. Neutral gray balance is essentially the determination of the brightness, saturation, hue of the three primary colors, and the calibration of the color hierarchy curves.
V. Narrative questions
Answer: 1. Whiteness, smoothness, absorptivity, and surface efficiency of the paper affect the tone and color reproducibility of the print. The tensile strength of paper affects the printing speed, and high-speed printing must use paper with high tensile strength. The surface strength of the paper not only affects the printing speed, but also affects the printing plate's resistance to printing and the surface condition of the print.
2. The color shift, color efficiency, and gray level of the ink directly affect the print color effect. The viscosity, adhesiveness, contact deformation, yield value, and drawability of the ink are related to the transfer performance of the printing ink on the printing press. For example, the offset printing ink is a highly viscous ink and must have good thixotropy in order to develop between the ink rollers. The city is even and transferred to the substrate to obtain good quality printed materials.
3. Resolving power of printing plate, light tolerance, grain fineness, hydrophilicity of printing plate, ink adhesion, firmness of printing plate adsorption image, quality of printed dots, ink absorption effect of printing plate during printing, ink and water balance And the quality of printed images plays an important role.
4. The ink-receptive performance, hardness, elasticity, and abrasion resistance of the printing ink roller are crucial for the uniform transfer of ink and the smooth transfer of the ink.
5. The elasticity, surface uniformity, and compressive deformation of the blanket have a direct impact on the normal transfer of printed graphics, the deformation of dots, and the precision of overprinting.
Advanced electronic color separation operation skills identification test
First, test questions
Select a reflection, two transmission originals for electronic color separation, imposition proofing.
Second, the test requirements and scoring criteria
1. The operation time is from the acceptance of the manuscript to the calibration until the end of the development and is completed in 60 minutes (40 points on time and 0.5 points for each minute).
2. Separation quality: After development and fixing, the color separation film passed 20 points, and the quality was not as good as possible.
3. The quality of the original manuscript was evaluated under the normal conditions of copying and printing.
4. Comply with safety procedures. (10 points)
I. Ambient questions (1 point for every space, total 20 points)
1. The color separation sheet can be obtained with an electronic color separation machine, a plate making ___, and a color __.
2. The electronic color separation machine consists of __, __, and __.
3. Because of the external light radiation, it acts on the eyes of the person and thus produces a __ feeling. Therefore, the color of the object is determined by the ___ stimulus of the outside world, and is determined by the __ characteristics of the human eye.
4. The formula for the reflection optical density is __, and the reflection density of the yellow ink is determined using a ____ color filter.
5. When observing the printed matter, the light source and the printed surface __, the angle of observation and the surface normal of the printed product become __ included angle.
6. There are __, __, __, surface efficiency, etc. that affect paper tone and color reproduction.
7. The quality check of the color separation film includes gradation correction, ___, image clarity, ___, layout cleanliness, __, and the like.
8. The shaded part of the color subprint relies on the dot __ to reproduce the color; under the red light, the blue print is observed and the __ color is seen.
Second, multiple-choice questions (4 points for each question, a total of 20 points. Each question can only choose one correct answer, multi-choice answers to the wrong score)
1. When the color separation sheet is developed, the developer in the developer is ().
A. Accelerator B. Reducing agent C. Oxidizer D. Inhibitors
2. For a reader with a visual acuity of 1.0, within the distance of visual sight, the dot line number of () should be selected for printing.
A. 34 lines/cm B. 48 lines/cm C. 80 lines/cm D. 60 lines/cm
3. A color absorbs light having a wavelength of 500 to 600 nm and reflects light having a wavelength of 400 to 500 nm and 600 to 700 nm, and the color is a () color.
A. Green B. Magenta C. Red D. Qing E. yellow
4. For color image prints, the quality of the bulk prints must be guaranteed and must be controlled ().
A. Solid density B. Paper whiteness C. Printing sequence D. Dot gain value
5. The gravure grid acts as a ().
A. Reproduce the level of the original image B. Support scraping force C. Reproduce the color of the manuscript D. Quantitative ink supply
Three, calculation questions (10 points)
The dot coverage on the original was 75%, and the dot density at the 75% corresponding to the original was measured to be 0.85, and the spot density was 1.5. The dot gain and relative contrast were calculated.
Four, short answer questions (10 points for each question, a total of 30 points)
1. Write the following definitions of printing technology terms: print copy characteristics, color scales, density ranges, and measurement and control strips.
2. What is the difference between laser screening and screen screening in electronic color separation?
3. Why neutral grey balance in color reproduction?
V. Narrative questions (20 points)
Describe the impact of the printability of paper, ink, printing plates, ink rollers, and rubber markets on print quality.
Test sample answers
First, fill in the blank
1. Camera Desktop Publishing System
2. Scanning unit recording unit color ratio computer
3. Color physical vision
4. D=lg1/R blue
5. Vertical 45°
6. Whiteness Smoothness Ink absorption
7. Color correction size specification image positive and negative
8. Stacked black
Second, multiple choice
1. B 2. D 3. B 4. D 5.B
Three, calculation questions
Solution: FD=1-10-DR/1-10-DV×100%=1-10-0.85/1-10-1.5×100%=87%
Dot gain value: 2D=FD-FF=87 %-75%=12%
Relative contrast: K=DV-DR/DV=1.5-0.85/1.5=0.43
Fourth, short answer questions
1. A: Print copy characteristic curve: a curve that describes the relationship between the density of the original to the printed copy of each copy or dot.
Color mark: The standard of basic colors and mixed colors expressed by solid blocks and/or mesh toning blocks; it can also be used as a mark of each color separation plate when printing.
Density range: The range between the minimum and maximum density in the picture.
Measure and control strip: A strip of soft strips consisting of dots, fields, lines, etc. to determine and control the transfer of information during copying, printing, proofing, and printing.
2. A: There are the following differences:
(1) Number of screen lines: The number of lines added to the screening screen will be the same when changing the screen angle, while the screen angle of the electronic laser screen will be different from that of the screen screen.
(2) Dot shape: The dot shape of the screening screen depends on the screen characteristics such as square points, dots, chain points, etc. The edges of the screen dots are smooth. Electron laser screening a network of dots can be combined by hundreds of exposure, its shape is arranged in a multi-grid structure, the dot edge is tooth-shaped and not smooth;
(3) Screen dot screen dot density is gradually decreasing from the center to the edge line, and there is a transition zone at the edge of the dot dot. The quality of the small dot dot is not high enough; the density of the dot center and the edge of the electron laser dot screen is uniform, so the dot point definition is high. Even 1% of outlets are clear.
3. A: The gray balance is the basis for color reproduction, because from the principle of color rendering, all the colors on the printed material are the three primary colors of pigment: yellow, magenta, cyan, and their mixed colors. The three primary colors of light are red, green, and blue. Absorption, reflection formed. Absorption of the three primary colors of the color light is black, and the three primary colors of the totally reflected color light are white, and neutral gray and color of different gray levels appear in the transition band from white to black. In the case of color reproduction, if the gray balance is not reached, color and gradation reproduction will be seriously deviated. Neutral gray balance is essentially the determination of the brightness, saturation, hue of the three primary colors, and the calibration of the color hierarchy curves.
V. Narrative questions
Answer: 1. Whiteness, smoothness, absorptivity, and surface efficiency of the paper affect the tone and color reproducibility of the print. The tensile strength of paper affects the printing speed, and high-speed printing must use paper with high tensile strength. The surface strength of the paper not only affects the printing speed, but also affects the printing plate's resistance to printing and the surface condition of the print.
2. The color shift, color efficiency, and gray level of the ink directly affect the print color effect. The viscosity, adhesiveness, contact deformation, yield value, and drawability of the ink are related to the transfer performance of the printing ink on the printing press. For example, the offset printing ink is a highly viscous ink and must have good thixotropy in order to develop between the ink rollers. The city is even and transferred to the substrate to obtain good quality printed materials.
3. Resolving power of printing plate, light tolerance, grain fineness, hydrophilicity of printing plate, ink adhesion, firmness of printing plate adsorption image, quality of printed dots, ink absorption effect of printing plate during printing, ink and water balance And the quality of printed images plays an important role.
4. The ink-receptive performance, hardness, elasticity, and abrasion resistance of the printing ink roller are crucial for the uniform transfer of ink and the smooth transfer of the ink.
5. The elasticity, surface uniformity, and compressive deformation of the blanket have a direct impact on the normal transfer of printed graphics, the deformation of dots, and the precision of overprinting.
Advanced electronic color separation operation skills identification test
First, test questions
Select a reflection, two transmission originals for electronic color separation, imposition proofing.
Second, the test requirements and scoring criteria
1. The operation time is from the acceptance of the manuscript to the calibration until the end of the development and is completed in 60 minutes (40 points on time and 0.5 points for each minute).
2. Separation quality: After development and fixing, the color separation film passed 20 points, and the quality was not as good as possible.
3. The quality of the original manuscript was evaluated under the normal conditions of copying and printing.
4. Comply with safety procedures. (10 points)
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