1. Basic Terminology

Key Concepts

digital images
resolution
pixel dimensions
bit depth
dynamic range
file size
compression
file formats

additional reading

RESOLUTION is the ability to distinguish fine spatial detail. The spatial frequency at which a digital image is sampled (the sampling frequency) is often a good indicator of 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. Generally, but within limits, increasing the sampling frequency also helps to increase resolution.

Pixels: Individual pixels can be seen by zooming in an image.

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