Scanning Techniques and Proper Storage of Different Types of Originals (2)

TIFF file format

TIFF is an abbreviation for Tagged Image File Format. It is a storage format defined for storing black and white images, grayscale images, and color images. Now it has become an important file format for publishing multimedia CD-ROMs. . The TIFF bitmap can have any size and resolution, and it can theoretically have infinite depth. The TIFF format can encode grayscale, CMYK mode, index color mode, or RGB mode. It can be saved in compressed and uncompressed formats. Almost any application that involves bitmaps can handle TIFF file formats—whether it's placing, printing, trimming, or editing bitmaps.

In TIFF files, 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. However, the TIFF format handles the clip path. Both QuarkXPress and PageMaker can read the clip path and correctly subtract the background.

EPS file format

EPS is the encapsulated Postscript (Encapsulated Postscript) format, which is a page description language designed by Adobe for printing files to any printer that supports the Postscript language. The EPS file format can be used for encoding pixel images, text, and vector graphics. If the EPS is used only for pixel images, the trapping information and the tone copy transfer curve may remain in the file, and 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 Postscript printers. 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 and processed by the printer. There are hundreds of printers that support the Postscript language, including all image typesetting systems used in the desktop publishing industry. Therefore, the EPS format is a file format used by the professional publishing and printing industry.

JPEG file format

JPEG is the most common compressed image file format. For situations where the image accuracy is not high enough and large amounts of image files need to be stored (website), JPEG is the best choice. But remember that JPEG is a lossy compressed file format. When saving, there will be a compression ratio (image quality level) selection. If you require high image quality, please select high quality (High8 or higher) image compression method, the image capacity will be relatively Large; Conversely, the file size becomes smaller, but the image quality will be greatly reduced. There are 3 options in the Format Option: Standard, Optimized, and Progressive. The progressive mode is for web pages. We can set the level of progressive display. The main disadvantage of the JPEG format is also its biggest advantage. That is, the lossy compression algorithm limits the JPEG to the display format, and loses some data each time the JPEG format image is saved. Therefore, it is usually only possible to save the image once in JPEG format at the final stage of creation.

PDF file format

PDF is the abbreviation of Portable Document Format, which is an electronic document format and is widely used in the transmission and storage of Internet electronic documents. The PDF format has built-in compression (JPEG, TIFF, LZW, and CCITT fax formats), and generally consists of four parts, a file header, file body, cross body (cross-reference table), and a file footer composed of one line of characters. PDF files can now be generated in a variety of ways, such as Adobe's PDF Writer or Acrobat software packages. Using Adobe Distiller, combined with a portable printer description file of the same name, the PS file can be converted into a PDF file and printed directly. All data in PDF files, such as color images, continuous tone images, monochrome images, and text and vector images, can be compressed using different compression methods. This also means that PDF files are usually much more than the original layout files and image files. smaller.

in conclusion

There are many techniques for using the scanner. Here are some instructions for scanning different types of originals. Similarly, the process of saving an image is also very important. According to the purpose of the image, choosing the correct storage format can reflect the efficiency and quality of the scanner. Only really mastering these techniques can scan real, ideal images.