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For practical purposes the clarity of the image is decided by its spatial resolution, not the number of pixels in an image. In effect, spatial resolution is the number of independent pixel values per unit length. The spatial resolution of consumer displays ranges from 50 to 800 pixel lines per inch.
An image size can be changed in several ways. Consider resizing a 160x160 pixel photo to the following 40x40 pixel thumbnail and then scaling the thumbnail to a 160x160 pixel image. Also consider doubling the size of the following image containing text.
A recreation of the Hogwarts Express lies at the entry to Hogsmeade. The recreation features "billowing steam and an iconic whistle" and is accompanied by the conductor of the train. In the Harry Potter series the Hogwarts Express is the train used to transport students from London to Hogwarts. The "Owl Post" is a working post office (where ...
In the examples above, the size of the image is scaled based on each user's default image size, which can be changed at Special:Preferences. Setting image size in pixels, such as "250px", would override the user's preference and display the image as 250px wide for all users who view that image on that page.
(* The pixel number of 6,000x4,000 ist the number of "effective pixels". The sensor usually has a few extra rows of pixels on all four sides, which explains the sensor resolution of 24.3 MPixels often stated, but no information about the exact image size available.) 6,016 4,000 24,064,000 24.1 Nikon D3300 Canon M50: 6,048 4,032 24,385,536 24.4
The picture this screenshot is taken from is 1194 pixels wide and 1174 pixels tall. Image sizes on Wikipedia can be determined by doing the following: Go to the image page by clicking on the image thumbnail; Under the image there should be a set of numbers in the form "NNNNxMMMM." This is the size of the image in pixels.
File:Harry Potter 20th Anniversary Return to Hogwarts poster.jpg; File:Harry potter and the chamber of secrets alternate.jpg; File:Harry Potter and the Chamber of Secrets Coverart.png; File:Harry potter and the deathly hallows part 1 game final cover.jpg; File:Harry Potter and the Half-Blood Prince (video game).jpg