The incredible shrinking files: JPEG puts the squeeze on PC graphics

Article Abstract:

Software implementations of the Joint Photographic Experts Group (JPEG) international standard, for color-image compression on a microcomputer, are not all the same. They vary in both features and performance. MS-DOS-based programs are generally faster than those that are Windows-based. Some programs do not work with the TIFF format, so that files must be converted into another format, which adds an extra step to the compression process. Some products use a proprietary version of JPEG, so that transmitted files will not be usable by someone who does not have the same software. Process indicators, which allow estimates of how long a compression will take, are included in some programs and, if available, they are recommended. Some JPEG compression products require considerable memory. This is especially true of Windows-based products. Results of testing JPEG programs for DOS and Windows are provided. The tests were done by compressing and decompressing the same image at different compression ratios. Of the products tested, Alice-DOS 1.2, from Telephoto Communications Inc, is reluctantly chosen as best.

Prepackaged software, Software, Standard, Standardization, Graphics software, Buyers Guide, Directories, Image processing, Color, Data compression, Software Selection, Product selection

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Seeing is believing

Article Abstract:

Soft proofing is a process that uses the computer monitor to predict the outcome of a printed piece. Although this technique is seldom used, the monitor may actually prove to be a useful proofing device, and in the future, filmless printing technology may make it necessary. Without film, there are few options. A press proof is too costly for most projects. The most efficient way to approach soft proofing is to set the monitor to a known state, and use color matching software to convert CMYK image data into the appropriate RGB values. This allows the user to predict different output processes by loading the most appropriate CMYK profile. Soft proofing requires several components to work together, including the monitor, calibration hardware and software, and software that controls how CMYK data is converted to RGB for display.

Computer and Office Equipment, Innovations, Technology overview, Electronic publishing, Printing industry

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