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The Digital Photography Workflow Handbook by Uwe Steinmueller, Juergen Gulbins

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Image Size and Resolution

Image size and resolution are stated in different and often confusing units. Here is a quick overview of the commonly used naming systems and labels:

Photoshop’s Image Size dialog

Figure 4-5. Photoshop’s Image Size dialog

  1. File Size depends on the format and compression rate you use to save your image. File size is stated in KB or MB. The image in Figure 4-5 is a compressed TIFF at about 41,4 MB. The same image requires about 15 MB of disk space as a compressed JPEG. File size can vary enormously!

  2. Image Size in Pixels is stated using the height and width of the image as it is captured by the camera. A Nikon D70 produces images measuring 3008 × 2000 pixels ...

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