Resizing versus resampling

Typically, when folks talk about resizing an image, they mean enlarging or reducing it without changing the number of pixels in the image, as demonstrated back in Figure 3-1. By contrast, resampling an image means scaling it so the image contains a larger or smaller number of pixels. With resizing, an inverse relationship exists between size and resolution — size increases when resolution decreases, and vice versa. But resampling affects either size or resolution independently. Figure 3-22 shows an image resized and resampled to 50 percent of its original dimensions. The resampled and original images have identical resolutions, but the resized image has twice the resolution of its companions.

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Photoshop Secrets

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