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thresholding

The process of rendering all areas darker than a set value as black, and all areas lighter than a set value as white. Useful when converting grayscale images to black and white.

TIFF

Tagged Image File Format. A bitmapped file format for images, capable of storing up to 24-bit depth images. TIFF file format is especially appropriate for scanned images and is supported by many programs and computers. TIFF files are saved with the filename extension .tif.

TIFF compressed

Tagged Image File Format, compressed. A bitmapped file format for images, capable of storing up to 24-bit depth images. TIFF file format is recommended for scanned images and is supported by many programs and computers. TIFF compressed files use data compression to reduce the size of the resulting file. TIFF compressed files are saved with the filename extension .tif.

tone

The overall effect produced by the combination of lighting, shade, and color.

toolbar

The area that contains buttons for a program's controls.

ToolTip

Glossary 131

transparency adapter

Abbreviated as XPA. An optional accessory used to scan negatives and slides. An XPA connector is plugged into the scanner, and a template is used to position the transparency above the glass.

True Color

An image type that is rendered with 24-bits per pixel per color.

TWAIN

An industry-standard communications protocol for sending instructions to hardware (such as a scanner) and receiving image data back from them. If you are using a program that supports TWAIN, you can start the HP Precisionscan Pro software directly from that program.

u

uniform scaling

A method of stretching or shrinking an image proportionately in both the vertical and horizontal directions.

USB

Universal Serial Bus. An interface for connecting peripherals, such as scanners, to a computer.

v

vector

A brief description that appears when the mouse pointer pauses over a control (such as a menu item or toolbar button) in a software program’s window.

A type of image that uses algebraic equations to define the various lines and curves of the image.