What is a pixel?

According to the definition, pixel refers to the basic original pigment and the basic assembly of its gray level.

Code. Pixel 1 is the basic unit of a digital image, and the resolution of the image is usually expressed in pixels per inch (PPI).

For example, the resolution of 300x300PPI means that the number of pixels per inch in the horizontal and vertical directions is 300, which can also be expressed as one square inch.

There are 90,000 (300x300) pixels in an inch. 2

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 unit of the image-pixels. This smallest graphic unit usually displays a single coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is.