Ps, since the resolution is equal to the product of two pixels, why fill in the resolution when both pixels are filled in?

Pixels are composed of letters of the words Picture and Element, and are units used to calculate digital images. Like photographic photos, digital images also have continuous shadows. If you enlarge the image several times, you will find that these continuous tones are actually composed of many small squares with similar colors, which are the smallest units of the image. This smallest graphic unit can usually display a coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is. Pixel is usually considered as the smallest complete sample of an image.

For example, a "640 × 480 display" has 640 pixels in the horizontal direction and 480 pixels in the vertical direction (just like a VGA display), so its total number is 640× 480 = 307,200 pixels.

Resolution is the accuracy of the screen image, which refers to the number of pixels that the display can display. Because the points, lines and surfaces on the screen are all composed of pixels, the more pixels a display can display, the finer the picture will be, and the more information can be displayed on the same screen area, so resolution is one of the very important performance indicators. The whole image can be imagined as a big chessboard, and the resolution is expressed by the number of intersections of all warp and weft.

Resolution is a parameter used to measure the amount of data in bitmap images. Usually expressed as pixels per inch (ppi) and dots per inch (dpi). The more data it contains, the longer the graphic file and the richer the details.