What is Pixel, How does it Related to Video Resolution?

Pixels are the building blocks of digital images and videos. A pixel, short for "picture element," is the smallest unit of a digital image or video that can be displayed or manipulated. Each pixel contains information about color, brightness, and contrast, and when combined with millions of other pixels, creates a visual representation of an image or video.

Pixel and Video Resolution

Video resolution refers to the number of pixels that make up the image on a display screen. It is usually represented by two numbers, such as 1920x1080 or 3840x2160, which represent the width and height of the image in pixels. The higher the resolution, the more pixels there are, and the sharper and more detailed the image appears.

For example, a standard definition (SD) video has a resolution of 720x480 pixels, while a high definition (HD) video has a resolution of 1920x1080 pixels. 4K videos, which are becoming increasingly popular, have a resolution of 3840x2160 pixels, and 8K videos have a resolution of 7680x4320 pixels.

Pixel Density

Pixel density is another important factor in video resolution. Pixel density refers to the number of pixels per inch (PPI) on a display screen. The higher the pixel density, the more detailed and sharper the image appears.

For example, a 4K TV with a 55-inch display has a pixel density of 80 PPI, while a 1080p TV with the same display size has a pixel density of only 40 PPI. This means that the 4K TV will produce a sharper and more detailed image than the 1080p TV.

Pixel Aspect Ratio

Pixel aspect ratio refers to the shape of the pixels in an image or video. Pixels are typically square, but they can also be rectangular, depending on the aspect ratio of the display screen.

For example, a standard definition (SD) video has a pixel aspect ratio of 4:3, while a high definition (HD) video has a pixel aspect ratio of 16:9. The pixel aspect ratio determines how the pixels are arranged on the screen, and affects the overall appearance of the image or video.

Conclusion

In summary, pixels are the smallest units of a digital image or video, and video resolution refers to the number of pixels that make up the image on a display screen. Pixel density and pixel aspect ratio also play important roles in determining the quality and appearance of a video. As technology continues to advance, video resolution and pixel density will continue to increase, leading to even sharper and more detailed images and videos.