User manual MICROTEK SCANMAKER 1000XL PRO Reference Manual

[. . . ] Microtek ScanWizard Pro Reference Manual Macintosh version i Copyright 2001 by Microtek International, Inc. All rights reserved. Trademarks Microtek, AritxTM, and ScanWizardTM Pro are trademarks or registered trademarks of Microtek International Inc. Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated. Macintosh and Apple are registered trademarks of Apple Computer, Inc. Windows is a registered trademark of Microsoft Corporation. [. . . ] ScanWizard Pro allows direct scanning in the following color spaces described below. RGB RGB (Red, Green, and Blue) images use three colors to reproduce up to 68. 7 billion colors. Because scanners and monitors are RGB devices, the RGB color space is the most commonly used space for capturing and displaying images. ScanWizard Pro offers standard RGB and 48-bit RGB color selection, with the 48bit option available for the ScanMaker 5, ScanMaker 2000, the Artix line of scanners, and other Microtek professional pre-press scanners. Grayscale Grayscale images use shades of gray to simulate gradations of color or tonal values, and contain 8 bits per pixel. The Grayscale 16-bit option is provided in ScanWizard Pro for professional pre-press scanners. CMYK CMYK images are made up of the standard four colors (cyan, magenta, yellow and black or K) for separated film or digital files used for sheetfed or web offset printing. CMYK mode instantly converts the scanner's RGB input to the CMYK color space. CMYK images are four-channel images, containing 32 bits per pixel. Lab Color Lab images are three-channel images containing 24 bits per pixel. Lab mode is useful for editing a pixel's luminance but not its color values. Lab mode produces device-independent color and is recommended for moving images between systems or printing to a PostScript Level 2 printer. 60 Microtek ScanWizard Pro for Macintosh Web / Internet Colors This mode is useful for displaying images on the Web or Internet. Output for the Web / Internet color mode in ScanWizard Pro is 8-bit, 256 indexed color images in the sRGB color space. 256 Colors (Default) / 256 Colors (Custom) These are single-channel images (8 bits per pixel) that use a color lookup table containing up to 256 colors. The file size is smaller for images in this mode. As an initial setting, selecting 256 Colors (Default) uses an Adaptive palette with Diffusion. If the 256 Colors (Custom) option is selected, the dialog box below appears. 1) Palette: The Palette option lets you choose the method for creating the color palette table. Uniform uses a 6-6-6 fixed color palette table. Adaptive (default) creates a color palette table from the more commonly used areas of the color spectrum that appears in the image. 2) Dither: The Dither option can improve the color quality of the 256-indexed color image for photographs or continuous-tone images, using a technique of mixing available colors to simulate missing colors. Pattern uses a structured pattern to simulate missing colors. Diffusion (default) uses the error diffusion technique to dither colors and produces the best quality for 256 colors. [. . . ] With more GCR applied, less color ink and more black ink produces the same color. Advantages & Problems of GCR The main advantage of GCR is it reduces the effects of variations on press, so when ink coverage varies, the colors become slightly lighter or darker, rather than changing hue. Increased amounts of GCR also allows your printing company to use a somewhat higher proportion of black ink, thus reducing cost--which saves you money. High levels of GCR and/or UCR expand the overall gamut, so darker and more saturated colors are achievable. However, with too light GCR you may not get as saturated a color as with higher levels of GCR. 140 ScanWizard Pro for Macintosh Professional CMYK Profiles Package What You Get with Professional CMYK Profiles Package "Professional CMYK Profiles" was developed for the serious professional, who is concerned about productivity, quality separations, and color fidelity. [. . . ]