【Resolution】
1. How to distinguish between screen resolution and image resolution?
- Display resolution: The number of pixels that make up the screen of a display (liquid crystal display).
- Image resolution: The number of pixels in an image.
When the resolution of the image is greater than the resolution of the display, there are two display methods. One is local display, that is, as many pixels are displayed as there are pixels on the screen. At this time, only a certain part of the picture can be seen, and it can be moved up, down, left and right. See full content. Another method is to display a complete image on the screen. At this time, the pixels of the picture will be compressed. For example, a 2560X1600 picture will delete some pixels and display it with a resolution of 1920X1080 (the resolution of the display). At this time, you can see the complete picture content, but a small number of pixels are lost in the details. For example, you can see the complete picture on the screen of a digital camera, but it feels very blurred. It is much better to view it on the computer. because of the low resolution of the screen.
When the resolution of the image is smaller than the resolution of the display, there are also two display methods. One is to display the actual size, that is, the resolution of the picture, and how many pixels on the screen are used to display it. At this time, the screen is point-to-point. way to display the picture, but the picture is not full screen, only part of the center of the screen. Another method is full-screen display. At this time, the picture is not compressed pixels, but a lot of pixels are artificially inserted. The picture looks large and is displayed on the full screen, but there are very few effective pixels. For example, a very small The icon file is put on the screen to watch, but the picture is terrible. Original URL: https://zhidao.baidu.com/question/396307126.html
2. Common unit PPI (pixel per inch)
- pixels per inch
- X: length in pixels Y: width in pixels Z: screen size (diagonal length)