1 inch = =25.4mm, and the pixel size of A4 paper image is (2 10/25.4) * Resolution × (297/25.4) * Resolution.
When you set the resolution to 72 pixels per inch, the size of A4 paper image is 595 pixels× 842 pixels.
When you set the resolution to 150 pixels per inch, the size of A4 paper image is 1240 pixels * 1754 pixels.
When you set the resolution to 300 pixels per inch, the size of A4 paper is 2479 pixels× 3508 pixels.
Extended data:
Several other concepts derived from the pixel concept, such as voxel, texture element and surface element, are also used in other computer graphics and image processing applications.
Dots are sometimes used to represent pixels, especially for computer marketers. In most cases, DPI (dots per inch) is used.
We can use pixels in visual images (such as printed pages), electronic signals, digital representations, displays or digital cameras (photosensitive elements).
Many other examples can be added to this class list, using more precise synonyms according to the context, such as pixels, sampling points, bytes, bits, points, points, supersets, triples, edge sets, windows and so on.