Analyze common file formats for digital printing
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In digital printing, TIFF, EPS, and JPEG are the three most commonly used data formats. EPS and TIFF formats are the two most commonly used formats for desktop publishers; JPEG format is widely used in Wanwei or multimedia; Other formats used are: PICT, GIF, BMP, WMF, etc., but usually converted to the three commonly used file formats before use. The following focuses on TIFF and EPS formats.
TIFF file format
TIFF is an abbreviation for Tagged Image File Format, which was developed by Aldus and Microsoft for scanner and desktop publishing software and is used to store black and white images, grayscale images and color images. The defined storage format has now become an important file format in publishing multimedia CD-ROMs. TIFF bitmaps can be of any size and resolution. In theory it can have an infinite depth. The TIFF format encodes grayscale, J-health, CMYK mode, indexed color mode, or RGB mode. It can be saved in both compressed and uncompressed formats. Almost all applications that involve bitmaps in their work can handle TIFF file formats—whether it's placing, printing, trimming, or editing bitmaps. The current version of the TIFF format supports high-resolution color, which divides different parts of an image into blocks, or blocks of data. For each block, a flag is saved that provides information about what the block looks like. The advantage of the block is that the software package supporting the TIFF format only needs to save the part of the image currently displayed on the screen. The portion of the image that is not displayed on the screen is also saved on the hard disk and loaded into memory when needed. This feature is important when editing a very large, high-resolution image.
In the TIFF file, no tools contain screen processing instructions. Screen processing is controlled by a program that prints TIFF format files. If you want to save the screen processing instructions while saving the bitmap, you must use the EPS file format. But the TIFF format can handle the clipping path, and both QuarkXPress and PaceMaker can read the clipping path and correctly subtract the background.
EPS file format
Encapsulated PostScript (Encapsulated PostScript) format. The PostScript language is a page description language designed by Adobe to print files to any printer that supports the PostScript language. It is like Basjc, C or any other programming language except that it is optimized for printing text and images on paper. When you work on a PostScript printer and tell the word processor (or any other application) to print the page, the computer writes a program in PostScript to describe the page and pass the program to the printer. The printer actually has a fully functional computer and a PostScript language interpreter to execute the program, draw the graphics on virtual paper in memory, and then print them onto paper.
An EPS file is a PostScript file that includes header information, which allows other applications to embed this file in a document. There are some limitations to EPS files, and these restrictions do not apply to standard PostScript files. These restrictions are mainly rules to ensure that EPS files can be inserted into different files without damaging the file. The EPS file format can be used for encoding of pixel images, text, and vector graphics. If the EPS is only used for images like Qinji (for example, selecting an Adobe Photoshop program as an output), the net information and the tone copy transfer curve can be retained in the file, while TIFF does not allow such information to be included in the image file.
The EPS format is a format for printing. The PostScript language code embedded in the EPS file provides important print definitions, but this makes the file size larger. In addition, the value and memory overhead required to build a PostScript engine in software is also high. As a result, most web browsers do not support EPS files, and most image viewing shareware and free software do not support EPS files. For this reason, the EPS format cannot be used for image display on a Web site.