Chapter 2-Introduction to Scanners

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Brightness

Refers to the lightness and darkness of a color; also referred to as tone, or value

.tif

Images saved in this format are considered lossless, meaning when compressed they do not lose any of the data that renders the image, allowing the image to maintain its resolution

Contrast

The difference in visual properties that makes an object distinguishable between other objects and the background

Handheld Scanner

The user must move the scanner across the document; image quality is usually lower

Crop

To crop an image means to cut away, or trim the image

Drum Scanner

Used by the publishing industry; document is placed on a glass cylinder

Sheet-fed Scanner

Used to scan paper documents and photos; more portable than a flatbed scanner

Scanner

a device used to analyze an image and process it.

TWAIN

a standard of communication between the computer and scanner that allow images to be scanned directly scanned from an image editing program

.png

designed to replace the GIF format

.pdf

file format created by Adobe Systems for document exchange

.bmp

file format used to store bitmap digital images; it doesn't support any photo-specific features nor color management

.jpg

most common image format used by digital cameras; images are considered lossy

Flatbed Scanner

works like a copy machine; used for most documents, photos and even flat objects from a PC or laptop


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