Several digital printing common file formats
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There are many file formats for image storage, but only a few are widely used as actual standards. For digital printing applications, there are three commonly used data formats: TIFF, EPS, and JPEG. EPS and TIFF formats are the two basic formats that desktop publishers are most interested in; while JPEG format affects most of the time in Wanwei or People working on multimedia; using other formats such as: PICT, GIF, BMP, WMF, etc., usually converted to the three commonly used file formats before use.
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. Although the history of the TIFF format is longer than other file formats, it is still the most widely used industry standard bitmap file format, mainly due to the many improvements in the specifications of the TIFF format.
TIFF bitmaps can be of any size and resolution. In theory it can have an infinite bit depth, ie 1-8 bits, 24 bits, 32 bits (CMYK mode) or 48 bits (RGB mode) per sample point. 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 TIFF specification allows the use of two color modes, CMYK and RGB, to divide the image into four overprint colors and save the pre-separated image as a TIFF format. If a TIFF format file is placed in a page layout design or a similar program, no further color separation is required. When printing a cyan plate, the program simply pulls the cyan channel; when printing a red plate, simply pull the magenta channel; and so on. The TIFF format also saves index color bitmaps, but few people do this. For indexed color images, more often than not, choose to use the GIF format.
The TIFF format can contain both compressed and uncompressed pixel data. The compression method (LZW) is non-lossy (the image data is not reduced, that is, the information is not lost during processing), and can produce a compression ratio of about 2:1, which can reduce the original document to about half.
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 (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 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. The header information can be used by other applications to embed this file in the document. EPS files have some limitations, 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. For example, in Microsoft Word, you can embed an ESP file in a Word document in a Word. The most popular application of EPS files is to embed them in desktop publishing files, especially those created by PageMaker or QuarkXPress. Desktop Color Separation (DCS) was developed by Quark for Process Color processing. The DCS image is an EPS grid or image consisting of 5 parts: a low-resolution screen preview, plus cyan, magenta, yellow, and black layers. The DCS version 2.0 file can include more than 4 overprint colors, and can also include a certain number of spot colors or high fidelity color separations.
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.
Since the EPS file is actually a collection of PostScript language code, it can be printed in a variety of ways on a PostScript printer. Software that creates or edits EPS files can define capacity, resolution, fonts, and other formatting and printing information. This information is embedded in the EPS file and then read in and processed by the printer. There are hundreds of printers that support the PostScript language, including all image layout systems used in the desktop publishing industry. Therefore, the EPS format is a file format used by the professional publishing and printing industries.
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.
JPEG file format
JPEG file format - known for the "Joint Photo graphic Experts Group" standard for experts who want to get extremely dark images. Now, it has risen to the main format of compressed files published in print and the World Wide Web.
An image saved in the JPEG file format is actually a mixture of two different formats: the JPEG format specification itself, which is used to define the compression method of the image, and is included in the image data format of the resolution resolution and color mode. Photoshop and virtually every other application that can read and write JPEG file formats save image data in JFIF file format (JPEG File Interchonge Format) or other formats that are very similar to JFIF format. The JFIF file format is just a simple way to compress an image or surround JPEG, and they have no more features.
The original JFIF file format specification history allowed 8-bit grayscale images and 24-bit RGB images; however, Adobe's modified this format to handle 32-bit CMYK mode data. However, most layout applications actually The JPEG image in CMYK mode cannot be separated, so the modification made by Adobe is not very meaningful. The JPEG file format allows you to save images of 8-bit, 24-bit, and 32-bit depth using variable compression. For example, when When saving a Photoshop image in JPEG format, Photoshop gives a variety of save options: low compression ratio, medium compression ratio, high compression ratio, and best resolution. Experiments have shown that when printing or viewing on a monitor JPEG generally compresses the image to one-tenth of the original size without noticeable differences. The image is broken down into small squares of 8 × 8 pixel image units. This JPEG distortion is sometimes found in news images. The image was greatly compressed before being electronically transmitted, and then printed at a high magnification.
JPEG uses a lossy compression format, which makes it an ideal format for quickly displaying images and saving better resolution. It is also because the JPEG format can greatly compress the scanned or natural image, which is convenient for storage or transmission through a modem, and thus has been widely used on the Internet.
The JPEG format has a special variant called "Progressive JPEG". When creating a Progressive JPEG file, the data is arranged such that when the image is loaded, only a blurred image is displayed, and as the data is loaded, the image becomes clearer.
The main shortcoming of the JPEG format is its greatest advantage. That is to say, the lossy compression algorithm limits JPEG to the display format only, and some data is lost each time the JPEG format image is saved. Therefore, it is usually only necessary to save an image in JPEG format at the final stage of creation.
If you want to print images, especially high quality images, the TIFF format is a more suitable choice.