Pixel

• It is the smallest element that can be displayed on a screen. To be more simple, it is just a single dot on a display or a screen.

What is pixel density

• Many of us are not aware of the importance of Pixel Density in displays. It is the thing which describes the sharpness and clarity.
• Pixel Density is usually measured in PPI (Pixels Per Inch) which refers to number of pixels present per inch on the display.
• Higher the pixel density higher is the sharpness of the content. Pixel Density is calculated based on the resolution and size of the display.
• Pixel Density= Root((Horizontal Number of Pixel^2) + (Vertical Number of Pixel^2))/Screen Size
• Consider the below image. The alphabet “A” on the left is displayed on screen(32 inch display) with lower resolution. The alphabet “A” on the right is displayed on the screen(32 inch) with higher resolution which delivers better sharpness.

Pixel Density Vs Resolution

• Let us take 1920*1080 resolution in 32 inches display 1920*1080 (1080p) resolution give pixel density is 68.88 ppi.
• Let us take 1920*1080 resolution in 32 inches display 3840*2160 (Ultra HD) resolution give pixel density is 137.68 ppi.
• The above image shows the two different resolutions 1920*1080, 3840*2160.

Advantages and disadvantages of pixels

• The advantage is that a great amount of detail can be captured, depending on how many pixels were used.
• The disadvantage is that this usually means having to store many millions of pixels, and thus can result in very large file sizes.

Examples of Pixel