O

object-oriented software

Vector-based illustration applications (such as Adobe Illustrator, Macromedia FreeHand, and CorelDRAW) and page-layout programs (such as QuarkXPress, Adobe PageMaker, and Adobe InDesign). Vector-based illustration software is appropriate for creating graphics such as charts , graphs, maps, cartoons, architectural plans, and other images that require hard edges and smooth blends. Vector-based page-layout software is suitable for creating books, pamphlets, brochures , flyers, and other documents that combine images and text. Photoshop is raster-based software, rather than vector-based illustration software; it does not print object-oriented graphics as vectors.

one-quarter tone

A tonal value located approximately halfway between the highlight and midtone.

optimization settings

In Photoshop and ImageReady, features that put images in the best possible form for Web applications, such as the file format, color -reduction method, and matting settings. In Photoshop, optimization settings are available in the Save For Web dialog box. In ImageReady, these settings are on the Optimize palette.

Optimize palette

The ImageReady palette that contains controls for optimizing images for Web applications.

Options bar

In Photoshop, the area that contains settings for tools. When you select a tool in the Tool palette, the Options bar changes to reflect the options available for the selected tool.

overprint colors

Two or more inks that are printed one on top of the other.