In digital printing, TIFF, EPS, and JPEG are the three most commonly used data formats. EPS and TIFF are the two most commonly used basic formats for desktop publishers; JPEG format is widely used on Wanwei or multimedia; Other formats used are: PICT, GIF, BMP, WMF, etc., but they are usually converted to the three commonly used file formats before use. The following focuses on the TIFF and EPS formats.
TIFF file format
TIFF is an abbreviation of Tagged Image File Format. This file format was developed by Aldus and Microsoft for scanner and desktop computer publishing software. It 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 have any size and resolution. In theory it can have infinite depth. TIFF format can encode grayscale, J-key, CMYK mode, indexed color mode or RGB mode. It can be saved in compressed and uncompressed formats. Almost all applications involving bitmaps in their work can handle the TIFF file format-whether it is 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 data blocks. For each block, a logo is saved, which provides information about what the block looks like. The advantage of blockiness is that the software package supporting TIFF format only needs to save the part of the image currently displayed on the screen. The part of the image that is not displayed on the screen is still stored on the hard disk, and it is loaded into the memory when it is needed. This feature is very important when editing a very large high-resolution image.
In TIFF files, no tool contains 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. However, the TIFF format can handle the editing path, whether it is QuarkXPress or PaceMaker, it can read the editing path and can correctly reduce the background.
EPS file format
Encapsulated PostScript (Encapsulated PostScript) format. PostScript language is a page description language designed by Adobe to print files to any printer that supports PostScript language. Except that it is optimized for printing text and images on paper, it is like the Basjc language, C language, or any other programming language. 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 language to describe the page and sends the program to the printer. The printer is actually equipped with a fully functional computer and a PostScript language interpreter to execute this program, draw graphics on virtual paper in memory, and then print it onto the paper.
An EPS file is a PostScript file that includes file header information. Using the file header information allows other applications to embed the file in the document. EPS files have some restrictions, 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 to encode pixel images, text, and vector graphics. If EPS is only used for images like Qin Ji (for example, select the Adobe Photoshop program as the output), the information on the screen and the tone copy transfer curve can be kept 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 printing definitions, but this makes the file size larger. In addition, the value and memory overhead required to build the PostScript engine in the software are also high. As a result, most web browsers do not support EPS files, and most image viewing sharing software and free software also do not support EPS files. For this reason, the EPS format cannot be used for image display on Web sites.
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