screen resolution
Native resolution is written in a monitor's specifications, but what exactly does it mean? What happens if images are displayed at a resolution other than the "native resolution"? In particular, you can't help wondering what happens when an image is displayed in a resolution with a different aspect ratio.
 
The "number of pixels", or put another way "the number of points that light up", in an LCD screen is decided, and this "number of pixels" is the "native resolution." For example, this means that a monitor with a native resolution of "1920 × 1200" lights up, or turns off, 1920 horizontal rows (dots) and 1200 vertical rows (dots) of pixels to display images.
Then what happens if an image is displayed in a different resolution from the "native resolution," and in particular what happens if that resolution has a different aspect ratio to the "native resolution"? Let's consider a case where a "1280 × 1024" (horizontal : vertical = 5:4) image is displayed on an LCD monitor with a native resolution of "1920 × 1200" (horizontal : vertical = 16:10).
 
When a 1280 × 1024 image is displayed on a monitor with a native resolution of 1920 × 1200.
 
High-density monitors or Retina monitors sold by Apple are generally recognized as having a physical pixel density greater than 200 pixels per inch (PPI). This means that they have twice the pixel density of a high-resolution computer monitor. Smartphones and tablets are the main drivers for this trend due to their low cost and high pixel density, which is usually higher than 250 PPI. This means that the average person cannot see individual pixels on a high-density screen, 10-15 inches away on a smartphone or tablet, or 20+ inches on a laptop or computer screen.
 
In normal display (same magnification) the image with a resolution of 1280 × 1024 is displayed with that number of pixels. In other words, 1280 horizontal rows and 1024 vertical rows of pixels are used to display it. At that time 640 horizontal rows (1920 – 1280 = 640) and 176 vertical rows (1200 – 1024 = 176) are not lit up so black areas are created at the top, bottom, left and right.
 
DCI 4K has twice the screen resolution of 2048 x 1080 pixels on projectors (4096 x 2160 / approx. 17: 9) and is the 4K industry's 4K resolution. UHD 4K (also called UHDTV 4K), on the other hand, is the 4K resolution of the television industry, which was defined by the International Telecommunication Union (ITU). It has twice the horizontal resolution of 1920 x 1080 pixels Full HD (3840 x 2160/16: 9).
 
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