HP 4400C, 5400C manual Glossary

124 Glossary

aliasing

The visibly jagged steps along angled lines or object edges that result from sharp tonal contrasts between pixels. Seen in both black-and- white images and color images. Sometimes called Jaggies.

anti-aliasing

A technique that smooths transitions between pixels, reducing the jaggedness of curved lines.

approximate size

Reflects the amount of disk space a scan would require if saved to your computer. Approximate Size value does not apply if the output type for the scan is set to text; it only applies to an image representation of the scan.

auto(matic) cropping

Automatic cropping displays only the item(s) detected on the scanner bed, not any of the surrounding area.

automatic document feeder

Abbreviated ADF, it is an optional accessory that allows you to scan multiple pages.

Auto(matic) resolution

A feature of the scanning software that automatically applies the optimal output resolution to the selection area. For example, output resolution is automatically set to 200 when the True Color output type is selected, and set to 300 for the Black & White Bitmap (raster) output type.

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b

bit depth

The number of bits used to define the shade or color of each pixel in an image. A 1-bit image is black and white. An 8-bit grayscale image provides 256 shades of gray. An 8-bit color image provides 256 indexed colors and is associated with a specific palette or color table. A 24-bit image provides over 16 million colors. The greater the bit depth, the larger the size of the saved file. See also file size.

bitmap

A type of black-and-white, gray, or color image or picture made up of a matrix of individual pixels or dots. Often referred to as raster, raster bitmap, or raster image.

black & white bitmap

Black & white raster bitmaps contain only black pixels and white pixels, no colors or shades of gray. Each pixel represents one bit.

Black & White Threshold tool

The Black & White Threshold tool lets you change the dividing point for black-and-white pixels in an image that uses the Black & White Bitmap (raster) output type. All pixels below the threshold will be output as black, and all pixels above the threshold will be output as white.

border

A line surrounding the scanned image indicating scanning boundaries. Clicking the image reveals a selection border and handles that are used to define the scanning region.