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For printing, resolution describes how finely detailed an image is. Resolution is measured by pixels per inch (ppi) or dots per inch (dpi). In a similar way to thread count in cotton sheets and knots in handmade carpets, the higher the number per inch, the better the product.

more info is called dpi because dots are converted to pixels (ppi) when they are printed. In computing the image size of a file, pixels are counted along the width and height of the image. This measurement is called pixel dimensions and is expressed in MBs. A document’s size determines how large or small it will print based on its resolution.

It is also true that a file’s physical dimensions change as its resolution changes. When the file is rolled up tight with its pixels rolled up, it has a high resolution (pixel density), but it has a low (linear) size. Considering the (linear) size, the resolution is lower when rolled out flat. Its just like pastry!

In resizing, the image is enlarged without changing the number of pixels. In resampling, pixels are changed. Using interpolation methods, Photoshop resamples images by assigning colour values to new pixels based on existing color values.