Pixels: Individual pixels can be seen by zooming in an image. Generally, but within limits, increasing the sampling frequency also helps to increase resolution. This is why dots-per-inch (dpi) or pixels-per-inch (ppi) are common and synonymous terms used to express resolution for digital images. The spatial frequency at which a digital image is sampled (the sampling frequency) is often a good indicator of resolution. RESOLUTION is the ability to distinguish fine spatial detail. Pixel Values: As shown in this bitonal image, each pixel is assigned a tonal value, in this example 0 for black and 1 for white. The bits are then interpreted and read by the computer to produce an analog version for display or printing. The binary digits ("bits") for each pixel are stored in a sequence by a computer and often reduced to a mathematical representation (compressed). Each pixel is assigned a tonal value (black, white, shades of gray or color), which is represented in binary code (zeros and ones). The digital image is sampled and mapped as a grid of dots or picture elements (pixels). DIGITAL IMAGES are electronic snapshots taken of a scene or scanned from documents, such as photographs, manuscripts, printed texts, and artwork.
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