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The resolution 1920 × 1080 has also been referred to as a 2K resolution by other standards organizations like NHK Science & Technology Research Laboratories and ITU Radiocommunication Sector (which were involved in the standardization of 1080p HDTV and 4K UHDTV).

1920x1080 is one of the most popular monitor resolutions that people use. This is due to the fact that you are able to have great, clear image quality at this resolution and it doesn't require a top tier computer to power.

Full HD means that a monitor has 1920 pixels horizontally across the screen and 1080 pixels vertically, or 1920x1080, and that's why it's sometimes also shortened to 1080p. If you want to enjoy Full HD content, it's not enough to just have a Full HD TV or projector.

An image with 640x480 resolution will be displayed on a monitor as 640/72=8.9 inches by 480/72=6.7 inches, or 8.9 x 6.7 inches in size. Therefore an image with 640x480 resolution is a good size image to view on a monitor, email to a friend, use on social media or on a website.

1080p, also known as Full HD or FHD (full high definition), is a ubiquitous display resolution of 1920 x 1080 pixels. Resolution explains how many pixels a display has in width x height format, and the more pixels, the sharper the image looks.

Definition 2: Resolution can be expressed as the total number of pixels. With megapixel cameras, the resolution is generally the total number of pixels, divided by 1,000,000, and rounded off.

One line pair is a black line and a white line next to each other in the same orientation and with the same width. If you have 100 LP/mm resolution of a lens, this means that one find 100 black and 100 white lines within 1 mm projected on the film (or sensor).