What format is used to output images from PS to CD? What format should be used for transparency?
The resolution of the picture in PS is 300, and it is output to TIFF format (not compressed) after I merge it, and then imported to CD.
Question: 1. Will the effect be good?
Answer: 300DPI is no problem
2. And what extent should I zoom in and zoom out these pictures on the CD? (Referring to percentage) Will zooming in and out make stripes appear on the gradient?
Answer: Minimize zooming as much as possible, and zoom out is not a big problem. Magnifying more than 1.5 times will deteriorate the image quality, the larger the more obvious
3. What format should I use for the transparent image?
If you want a transparent image in the CD, PSD is better, but you ca n’t rotate or flip it, otherwise you will lose information
The most important question: I always use CMYK mode when processing graphics in PS. Will there be any color change when outputting to TIFF format? Will it change again when imported into CD?
Answer: There will be no change
What is color separation? In general, I hear people say that the sample is made. When others take it back, they need to separate the colors before they can make the film. What kind of process is this? Does the so-called color separation drawing mean that the four channels of MYK in PHOTOSHOP are printed separately? Also, what do people often say about using CD to make film?
Answer: Color separation is a printing professional term, which refers to the decomposition of various colors on the manuscript into four primary colors of cyan (C) red (M) yellow (Y) black (K); in computer printing design or graphic design In image software, color separation is to convert the color mode of scanned images or images from other sources to CMYK mode. If you want to print, it must be separated into four colors: yellow, magenta, cyan, and black. This is the requirement of printing. If the image color mode is RGB or Lab, there may be only dots on the K version when outputting. The color separation operation is actually very simple: just change the image color mode to CMYK mode. When outputting the film, the image will generate dots according to the color channel data, and be divided into four color separation film pieces of yellow, magenta, cyan, and black.
In general output, each color check can correct whether it needs to be hollowed out or imprinted. Films generally use four colors to output cyan (C), red (M), yellow (Y), and black (K), each with a film. CD is a typesetting and drawing software (full name: CorelDRAW8 / 9 / 10.0 / 11.0)
What does register mean?
Because printing uses four color plates to achieve color reproduction, the registration method can be used to accurately align the positions of the four color plates. In the design draft, you can make some front sights or crosshairs to achieve it. Some software can automatically generate registration marks on the four color plates.
Spine problem
Normally, make a positive picture and text first, and then do it at the end. Or you can calculate the size of the spine by calculating the required P number, the thickness of the paper, or measuring it with a ruler.
What is a network cable?
The network cable is the number of lines added. The unit of expression is lpi. For general reporting lines, 75 to 90 lines (75 to 90 lpi) can be used. 150 ~ 175 lines (150 ~ 175 lpi) for color offset printing. Because the former outlets are wired, it is customary to refer to all outlets as network cables. To be precise, the accuracy (resolution) of the digital image interpretation by the laser imagesetter on the film. The so-called network cable is the definition for printing. We are talking about resolution in design, which means the definition of the image. The relationship between the network cable and the resolution is: 1.5 times the network cable is equivalent to the resolution (in general).
Basic knowledge of printing dots
In the printing process, continuous tone and halftone images are adjusted by the density of the dots. And by mixing CMYK four-color dots, you can show an infinite number of colors.
There are two main types of dots currently used in the printing process: amplitude modulation dots (AM) and frequency modulation dots (FM).
AM outlet
Amplitude modulation outlets are currently the most widely used outlets. Its dot density is fixed, and by adjusting the size of the dots to express the depth of color, so as to achieve the transition of tones. In printing, the use of amplitude modulation dots mainly needs to consider factors such as dot size, dot shape, dot angle, and line accuracy.
Dot size
The dot size is determined by the coverage of the dot, also known as the ink rate. It is customary to like to use "cheng" as the unit of measurement. For example, a 10% coverage outlet is called "10% coverage", and a 20% coverage outlet is called "20% coverage". In addition, a 0% coverage outlet is called It is called “out of the netâ€, and the outlets with 100% coverage are called “on the groundâ€.
The tone of the printed matter is generally divided into three levels: bright tone, middle tone, and dark tone. The dot coverage of the bright tone part is about 10% to 30%; the dot coverage of the middle tone part is about 40% to 60%; the dark tone part is 70% to 90%. The net and field parts are divided separately.
Dot shape
The shape of the dots in printing is not just a circle that everyone imagines. It is divided by the shape of the dots at 50% inking rate. It can be divided into three types: square, round, and diamond.
The square dots form a checkerboard shape with 50% coverage. Its particles are relatively sharp and have a strong ability to express levels. Suitable for the performance of lines, graphics and some hard-tuned images.
The circular dots are independent in the case of bright tone or middle tone, and only partially connected in the case of dark tone. Therefore, for the poor performance of the mining level, it is rarely used in four-color printing.
The diamond-shaped dots combine the hard tone of the square dots and the soft tone of the round dots, and the color transition is natural, which is suitable for the expression of general images and photos.
Dot angle
In printing plate making, the choice of dot angle plays a crucial role. Choosing the wrong dot angle will cause interference fringes.
Common dot angles are 90 degrees, 15 degrees, 45 degrees, and 75 degrees. The 45-degree dots perform best and are stable without appearing dull; the 15-degree and 75-degree angles are less stable, but the visual effects are not dull; the 90-degree angles are the most stable, but the visual effects are too dull , No beauty.
When two or more kinds of dots are put together, there will be mutual interference. When the interference is serious enough to affect the appearance of the image, the commonly known "turtle" appears.
Generally speaking, when the angle difference between the two dots is between 30 degrees and 60 degrees, the overall interference fringe is still beautiful; the second is the angle difference between the dots at 45 degrees; when the angle difference between the two dots is 15 degrees and 75 degrees At this time, the interference fringes will damage the image.
Number of dots
The number of network lines determines the fineness of the image, similar to the resolution. Common line number applications are as follows:
10-120 line: low-quality printing, large-area printed materials such as posters and posters for long-distance viewing, generally use newsprint and offset paper for printing, and sometimes use low-gram powder and coated paper.
150 lines: Ordinary four-color printing generally adopts this precision, and all types of paper are available.
175-200 lines: exquisite picture books, pictorials, etc., mostly printed on coated paper
250-300 lines: the most demanding picture books, etc., most of them are printed with high-quality coated paper and special paper.
The following are the picture effects of different line numbers (the effect on the screen is really unsatisfactory, only for reference)
FM outlets
The screen adjustment dot is a newly added screening method developed since the 1990s. It differs from the amplitude modulation dot in that the screen dot size of the screen adjustment dot is fixed, and it is achieved by controlling the density of the dots. The dots in the bright part are sparse, and the dots in the dark part are dense.
See from the net mirror how many dots.
One net: Just put three dots of the same size between two diagonal dots.
Two-in-one net: Just place two dots of the same size between two diagonal dots.
Sancheng Net: Just place 1.5 dots of the same size between two diagonal dots.
Sicheng Net: There are exactly 1.25 dots of the same size between two diagonal dots.
Fifty percent net: Just put a dot of the same size between two diagonal dots.
Yicheng Net corresponds to Jiucheng Net. The two-fold network corresponds to the eight-fold network. The 30% network corresponds to the 70% network. Sicheng Net corresponds to Liucheng Net. But the size of the outlets is just opposite to the distance between them.
(A bitmap with a resolution of 300, we know that he means an image composed of 300 square pixels each horizontal and vertical. When the image is enlarged, you will find that it is composed of countless dots of different sizes. Since the printed matter is composed of dots, the number of screen lines of the printed image refers to the number of screen lines per inch in the horizontal or vertical direction of the printed matter, that is, the number of hanging net lines. The unit of the number of network lines is Line / Inch (Line / Inch), referred to as LPI. For example, 150Lpi means that there are 150 network lines per inch. To screen the image, the larger the number of meshes, the more the number of nets, the denser the dots , The richer the level of expressive power. The larger the dots, the darker the color and the darker the level; the smaller the dots, the lighter the color and the brighter the level. The line accuracy (Lpi) is not the same as the resolution (Dpi ) 1: 1 correspondence, for example, a picture of 150 lines requires a resolution of about 300 Dpi. The resolution is about twice the number of lines. If you do not pay attention to theory. It can be understood as the density of film or ink!
Intermediate color: The mixed color prepared by mixing two primary colors is called intercolor or secondary color, such as R, G, B, M80%, Y70%, C20%, Y80%, etc. can be called intercolor. Intermediate colors
Compound color: The color produced by the mixing of the primary color and the intermediate color, or the mixture of the two intermediate colors is called the compound color or the tertiary color. In fact, compound color is a mixture of three primary colors, but only a combination of one primary color.
Complementary color: After the two color materials are mixed, it is black, and then the two colors are complementary. The intermediate color of any one of the three primary colors and the other two primary colors is the complementary color. For example, M and G are complementary colors. If the two shades are mixed to form white, they are complementary colors.
On what basis is the trap value determined? What is the difference between Choke and Spread? What does Keep away mean?
(1) Trap control is performed at the interface where two colors are connected. The process of shrinking or expanding the foreground (or background), hollowing out or letting out are all called trapping values. In order to avoid whiteness at the overlap, the trapping value should be slightly greater than the four-color registration accuracy of the printing press. Due to the different printing processes, paper and printing machinery used in various color prints, the more precise the print, the higher the registration accuracy and the lower the trapping value. The US Printing Service and printing houses have published typical trapping values. For example: sheet-fed offset printing, the use of coated paper dot line number is 150lpi, its trapping value is 0.08mm; newsprint web offset printing, screen printing line number is 100lpi, its trapping value is 0.15mm.
(2) Shrinkage is to increase the area of ​​the (light) background so that it appropriately invades the darker foreground (text or image) on the border, while keeping the foreground outline shape unchanged.
Dilation is to increase the area of ​​the foreground with a lighter color, so that it appropriately invades the darker background area on the border, while keeping the background contour shape unchanged.
(3) Give way is when the background is black, and the foreground is hollowed out, you need to give way to the CMY three color versions, so that the foreground outline is defined by the monochrome black version.
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