The hottest plane output printing precautions

2022-10-15
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Notes on plane output (printing) (I)

in order to faithfully reproduce your creativity on paper, in addition to exquisite design, it is more critical to have standard and error free output as a guarantee. Therefore, it is very important for computer designers to understand the importance of output. Photoshop is the most widely used image processing software at present. To have a good output effect, the premise is to find the best manuscript; Use the best roller scanner; DPI is set to twice the printing line. Before making a four-color manuscript, the graphics must be converted to CMYK mode. If it exceeds 10 megabytes, it needs to be stored in EPS format and color separation. Do not use compression or other formats. After the pictures are finished and do not need to be modified, the unused channels must be removed. If there are multiple layers, you must merge all the useful layers and remove the unused layers before saving. After the edition is arranged, if the picture is modified or renamed, the picture must be repositioned or connected. Freehand is a widely used typesetting software at present. In order to obtain a good gradient effect, you should set a high resolution in the page before making it. In addition, it is recommended to use Photoshop or illustrator for gradient. Please use less fill and srtouch, pattern fill in the blank effect, so as not to affect the quality of output. CorelDRAW is the most used typesetting software on PC. If you want to get the best film or proofing in the shortest time, please don't use RGB color to fill color blocks or lines in the production process; After turning into a curve, the number of nodes of the text shall be controlled within 1500 points; Use PSD format as little as possible for graphic files; Spot color can be Pantone special color, not Pantone printing color

1. Skip word

there are two main reasons for skipping word during output: one is that the position of the word is not adjusted after changing the font, and the other is that there are spaces between words. For the former case, the only way is to readjust the position of the word after changing the font, while for the latter case, there are two solutions: first, divide the word into two parts and arrange it according to the original position; Another solution is to use TrueType font. After determining the position of the word and the figure, outline the word. However, it should be noted that the space between the words must be English space, otherwise after the outline, the empty position will appear "mouth"

2. Transparent black-and-white map

there is a problem in storing the map as a tiff map in grayscale mode in Photoshop and then placing it in freehand -- when choosing this is the permanent development theme of plastic flexible packaging, when choosing black overprint, if there are color blocks or other underlays under the grayscale map, the white part of it will become a color block or the corresponding part of the underlay. The reason for this problem is that the grayscale map placed in Photoshop by freehand is filled with k100 by default, When selecting black overprint, the white part is considered as CMYK is zero, which naturally shows the color of its color version. For this situation, there are two solutions: first, in Photoshop, turn grayscale into CMYK, in the CMYK general channel of the channel dialog box, selec all, copy to channel black, and then delete the images in C, m, and Y channels; Another solution is to change the coloring of grayscale map to Y1 and k100 in freehand, so that there will be no problem when selecting black overprint

3. Color

the color of the display has a certain impact on people's feeling of the picture, so it is necessary to use gamma software to adjust the screen to be close to proofing, so as to be closer to the color itself when the photo shop colors the picture in the future. It is better to adjust the screen color directly by the users who often use this machine, and do not rely on the sales manufacturers and other replacements, because each user's color sense is different. In freehand and other typesetting software, set the color to the printing color system. If you want to use a special color, you can choose Pantone color system, or set the color to spot type, that is, a specific color. When using a special color, it is best to store the image in bitmap format, because bitmap is not transparent. In typesetting, if you need to manually make cutting lines and alignment lines, you must set a four-color black color, namely C100, M100, Y100, k100, so that each color separation plate has it. At the same time, these lines must be set as hairline, namely the thinnest line, to improve the accuracy of version alignment. If there is another spot color on the above cutting line, these spot color lines must be made in situ at the same time. Freehand and other typesetting software, after setting, plus the color of more than 20000 employees in trade, are somewhat different from the actual screen. Therefore, it is usually possible to use the printing color code as a reference, and then set the hue, and use freehand to publish newspaper manuscripts. If it is a two-color overprint plate, but there are EPS pictures including monochrome black, at this time, the figure cannot be saved as grayscale mode, otherwise the figure will be divided into four colors when outputting, because only two versions are published, Therefore, many users of the map only consider the price of the pressure testing machine when purchasing the pressure testing machine, and often neglect that its quality and price are often linked, and the hue will become lower. Therefore, it is necessary to save the map in CMYK mode, copy the full version of the content to version K, and then delete the content of CMY version respectively, so as to ensure the correct output

4. Output light film

(negative film) there are generally three situations for output light film (negative film),

(1) it is required to enlarge the advertising light box

(2) when converting RGB to CMYK in computer production, if a certain color distortion is found, the RGB output lamp must be separately divided

(3) when the customer's lamp is accidentally damaged. Production requirements:

(1) computer files must be RGB

(2) channels and paths must be merged

(3) save in TIFF format

(4) make according to the proportion of lamp specifications, such as 4 "*5" 135 (240*320), not necessarily according to the actual production of lamp,

(5) the unit of measurement of lamp production is 2K, 4K, 8K 16K, 2K, that is, 1024*2=2048 pixels (pixels), 4K 1024*4=4096 pixels, and the rest of the units are pushed like this, for example: 4K 4 "*5" lamp contains 4096 pixels within the range of 5 ", which can also be expressed as 4096 pixels/5" =800 DPI picture scanning with high general elements, The 4 "*5" light film output into 4K can also cope with the printing of split posters, 2K 135 can be amplified by 8*10 "

5. The image mode noted during output

bitmap -- bitmap. Photoshop bitmap mode is a black-and-white image, and each pixel of the black-and-white image is represented by 1-bit data, that is, the pixel of the display image is either black or white, so the image occupies the smallest storage space. But windows BMP is also a bitmap, but it occupies a huge space. Grayscale -- gray scale, in the gray scale mode, every pixel of the image A pixel is represented by 8 bits, and each pixel is represented by 256 gray levels (gray levels) between black and white. Gray image has no color. When converting a color image into gray, it is mainly applicable to measuring the impact toughness of plastic, rubber and other film materials and metal foil materials. Photoshop will appear a warning message of image information reduction, prompting users whether they really want to abandon color information. Indexed color -- indexed color. In the image with RGB, CMYK and lab modes, each pixel on the screen contains complete color information, but the image also occupies a large storage space. In the actual output, there are generally only dozens or hundreds of colors used in an image, so if the colors used are established into a color table, the color of each pixel on the screen is only a certain position in the color table, which can save the corresponding storage space of the image. Using this method to record or display the image is the index color mode. RGB color -- RGB mode is the main image display and processing mode of Photoshop. RGB mode is to synthesize most of the visible colors by using the basic components of red, blue, and green. CMYK color -- CMYK mode is composed of four basic colors: cyan, magenta, yellow and black. Various colors are generally used in the field of color separation processing of printing output. Lab color -- the lab mode represents the color with a luminance component L (lightness) and two components a and B, in which a component green evolves to red, while blue evolves to yellow

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