6. Barcode scanning
Like fine text, the bar code scanning resolution is higher than that of normal printed images, and must be guaranteed to be greater than 600 dpi. In addition, it is better to set the scanning color mode to Gray mode. If you use a line art binary image, it may cause edge jaggies.
The correct choice of storage methods Image file storage format can be divided into two broad categories: one is a bitmap image file; the other is called a vector file, also known as a descriptive or object-oriented class graphic image file. Bitmap image files describe graphic images in dot matrix format and are ideal for representing colorful works such as photographs and oil paintings. The most representative processing software is currently very popular Photoshop. A vector file is a graphical image composed of geometric elements described mathematically. Vectors do not need to record the information data of every pixel in the image like a bitmap, so its occupied disk space is generally much smaller than the bitmap. In addition, since the resolution of the image is meticulous, real and the resolution of the graphic image after scaling does not change, it has been widely used in professional-level graphic image processing. Specifically, the most commonly used image storage process is TIFF, EPS, JPEG three data formats, EPS and TIFF formats are the two basic formats of desktop publishers are most interested in; and JPEG format, which affects those People who work on the Internet or multimedia most of the time like to use it. In addition, such formats as PDD, PNG, and SVG are also included, but they are not commonly used, and they are usually converted into the above three formats when used.
TIFF file format
TIFF is an abbreviation for TaggedImageFileFormat. 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 FormatOption: Standard, Optimize, 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 an abbreviation of Portable Document Format, which is an electronic document format and is widely used in the transmission and storage of Internet electronic files. 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 PDFWriter or Acrobat package. Using Adobe Distiller, combined with a portable printer description file of the same name, the PS file can be converted to a PDF file for direct printing. 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.