Contents Selection Intro- pixel dimensions Conversion Quality Control Metadata Technical Presentation Digital Preservation Management Continuing Education
Basic Terminology-resolution Basic Terminology-bit depth

1. Basic Terminology

Key Concepts

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

additional reading



PIXEL DIMENSIONS are the horizontal and vertical measurements of an image expressed in pixels. The pixel dimensions may be determined by multiplying both the width and the height by the dpi. A digital camera will also have pixel dimensions, expressed as the number of pixels horizontally and vertically that define its resolution (e.g., 2,048 by 3,072). Calculate the dpi achieved by dividing a document's dimension into the corresponding pixel dimension against which it is aligned.


An 8" x 10" document that is scanned at 300 dpi has the
pixel dimensions of 2,400 pixels (8" x 300 dpi) by 3,000 pixels (10" x 300 dpi).

Reality Check

What are the pixel dimensions of a 5x7-inch photograph scanned at 400 dpi?

Answer (check one):

2,000 x 2,800 pixels

1,300 x 1,800 pixels


Reality Check

If an 8.5x11-inch page is scanned and has pixel dimensions of 2,550 x 3,300, what is the dpi?


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Basic Terminology - resolutionBasic Terminology - bit depth

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