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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
TIFF compressed
Tagged Image File Format, compressed. A bitmapped file format for images, capable of storing up to
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
TWAIN
An
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.