Glossary of Terms Apple Photo Access A System Extension that, in combination with Apple CD-ROM, and ISO-9660 File Access extensions makes possible the simple viewing of Photo CD images on a Macintosh. h computer. This extension not only makes the files accessible as PICT images to any appropriate application, it makes a QuickTime slide show of the images on the Photo CD disc with reference numbers for each image. CMYK The four-color subtractive (pigment) primary colors Cyan, Magenta, Yellow and Black. Required for reproduction on a printing press, these colors must be derived mathematically or photomechanically from color in another mode. Image Pac File An Image Pac File is the Photo CD file. It contains a number of individual components for an image, allowing it to be opened in black and white or color, and at five different resolutions from 72K to 18MB in size in fourfold increments. Image Pac files contain numerous components, some of which are compressed by the Kodak PCD Imaging Workstation. Pro Photo CD discs offer a sixth resolution image - called Base*64 which uses the Image Pac. and an Image Pal Extension. (see below) for this file. Image Pac Extension (IPE) The Photo CD Master disc uses standard Image Pac Files for its basic images, and adds the IPE file for an image that yields 72MB of information in RGB mode. When an image is opened in CMYK from a Photo CD disc, there are four channels of color information rather than the three in RGB files; this makes the files 25 percent larger. Base*64 files become 96 MB of data when converted to CMYK. Kodak CMS Color Profiles CMS profiles allow the user to set the source film (if known) and the output format of an image from Photo CD. Shipped with every copy of Adobe Photo.shop, the basic CMS set includes profiles for opening Photo CD in RGB, and CIE LAB color modes. Optional profiles can be purchased for opening Photo CD discs to CMYK directly. Kodak Photo CD Master Disc The original Photo CD disc. The Photo CD system scans from 35 mm film, and writes up to 72K images on the disc in one or more sessions. Each image is stored as an Image Pac a file which contains five resolutions of the same image. Preview Images Some applications and plug-ins afford a preview of the Photo CD image. Sometimes called a thumbnail, these previews serve as identifying images for selection, cropping and rotation. Kodak Pro Photo CD Master Disc Pro Photo CD discs contain six resolutions of a scanned image. The largest is 72 MEN when opened in RGB format. Professional Photo CD systems accept films up to 4 x 5 inches to be scanned. The capacity of this disc is up to 25 4 x 5 in. images in one or more sessions. RGB Red-Green-Blue, the primary colors of the additive (light) color system. Computer monitors work in RGB mode, and many applications use RGB images. Color printing. by contrast, requires that colors first be converted to CMYK (see CMYK). Slide Show Viewer The Slide Show Viewer application is created by the Apple Photo Access System Extension, and shows up only in Photo CD folders on the Macintosh computer. The Slide Show Viewer creates a QuickTime slide show, and allows a double-click to deliver the chosen image to any application that can accept PICT images, established in the application's Preferences window. Session Photo CD discs are WORM discs (Write Once, Read-Many) which means they cannot be erased or altered, but that they can have data appended to the existing information already on the disc. A session is the information written to the disc in one writing, including directory and subdirectory information. SNAP Specifications for Newspaper Advertising Publications. SNAP is to newsprint what SWOP is to commercial printing papers. The objective is the same: advertising consistency in a variety of printed publications on newsprint. SWOP Specifications for Web Offset Publications. Established by the SWOP Committee, a group whose aim is to make consistent the reproduction of advertising materials inserted in a variety of roll-printed publications. There are SWOP standards for both gloss and uncoated papers. YCC Kodak developed the YCC format for writing images to Photo CD discs because it is a format that makes both television and computer access to the disc easy. YCC:'s ancestor, Y-l-(2, was originally developed in the 1950s for the transmission of color television signals over a black and white broadcast system. By adding two sidebands for chrominance information, the black and white signal was not altered but color sets could receive the signal in color. Colorite Home Page OPTIMIZING PHOTO CD -- MENU