Printing knowledge that should be known before digital printing design
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Knowing more design content suitable for digital printing can reduce the difficulties in printing to avoid errors. Often, the files used for digital printing should be flexible and simple, without the need for very accurate color registration, color matching or accurate double-sided registration. Contact your digital printers and they will give you advice on special design, imaging and software settings. Large format design It is not necessary to always limit the design to a standard web size. Web digital presses, such as Agfa's Chromapress, can print larger webs because of the use of continuous paper strips. You can print posters and flags up to 11.8 meters long. Making black richer When printing black (especially overprinted text), black is usually mixed with a certain proportion of the other three colors to make the black richer. The rich black color makes the underlying color not reveal. The ratio of the other three colors varies with different presses, paper types, background colors, and the overall effect you want. (HOHO Note: Generally do not add 4 colors, mainly add 20% blue is enough, black will look better). Gradient To prevent uneven blending or uneven streaks in the gradient, the gradient is usually controlled from 1 to 4 inches. Use a lighter color with a gradient of no more than 50%. Using image processing software to add noise to the gradient can also help reduce unevenness. Image Some printing systems offer screening options that improve the quality of halftone images. You can ask the printer operator for samples that are printed under different screen and color adjustment settings to choose the setting that best suits you. High-key and dark-key The optimal threshold for high- and dark-tone parts varies with different presses. In general, the highlight portion cannot be lower than 5% C, 3% M and Y; the dark portion cannot be higher than 85% C, 75% M and Y. Field and gradient large area solid or flat screen printing using toner Streaks appear on the machine and should be avoided. This is caused by uneven charge charge or uneven distribution of toner particles. The above phenomenon is especially true for thick paper because the thicker paper has a lower affinity for the charge than the thin paper. To avoid this, use a lighter color or shading. Folding hands For printing presses that use dry toner, please avoid placing the dark part on the folding handle of the paper. If the high temperature is not fixed properly, the toner at the folding handle of the paper will crack, leaving a crack in the day. Therefore, if possible, print a lighter color or white space at the crease. Also, to prevent rough creases, make sure the folds are aligned along the paper texture. Cutting and binding You need to know clearly that the press adapts to the size of the paper to leave bleeding and cut as many edges as possible to facilitate cutting, especially on web presses or when attaching sheets, when you use saddle stitches To compensate for the intermediate page extrusion during binding, you must use “Binding Fine-tuning” during the imposition to adjust the position of each page. (HOHO Note: This is a very important part, everyone must pay attention). When the software uses the path cut function in Adobe Photoshop, the smoothness of the general image is 5 or 6. For a particularly small image, when the path is established, the smoothness is 1 or 2, and then the smoothness is set when the path is stored. 5. In addition, 1-bitTiff may be a problem when printing, please convert it to grayscale Tiff or bitmap PICT format. In the IIIustrator, convert the text font to a path. In QuarkXPress, avoid rotating the graphics in the graphics box separately, but rotate the entire graphics box. Personalization If you want to change the image or text for personal printing, you must determine the size of the replacement element for the same location and for a variable position. You need at least two proofs with different alternatives on each page to ensure that the different elements are placed in the same position correctly.