Resolutions : 720p vrs 1080p vrs 4k


720p vrs 1080p vrs 4k video is about TVs and video technology.  Every once in a while, there is a crossroads in technology that affects everything.

What is resolution and pixel density

Think of your TV screen as a grid, having pixels in rows and columns. Now if resolution is 720p, that means it has 720×1280 pixels.

This further means that 720 pixels across the screen rows and 1280 pixels down the screen as columns.

Based on this resolutions are defines as Np where N is pixels across width, and p stands for progressive scan, i.e. non-interlaced.

Standard Definition standards –

  1. 480p – 480 denotes a vertical resolution of 480 pixels, usually with a horizontal resolution of 640 pixels and 4:3 aspect ratio (480 × 4⁄3 = 640)
  2. 560p – DVD quality for SD formats

High Definition standards –

  1. HD displays are measured in terms of the pixels going across the screen in width having aspect ratio of 16:9
  2. 1080p – resolution of 1920×1080 (2.1 megapixel)
  3. 4K or UHD – resolution of 3840 pixels × 2160 lines(8.3 megapixels,


Video Quality Resolution

Difference Between 1080p vs BlueRay

Comparing resolution with storage formats with some encoding standards which is not comparable at all

1080i Vs1080p

1080i and 1080p are very similar. 1080i and 1080p both display images at the same pixel count as each other – 1920 x 1080. The difference is in how the images are made up on screens.
The lowercase ‘i’ in 1080i stands for interlaced scan. The lowercase ‘p’ in 1080p stands for progressive scan.
Interlaced scan renders images in vertical lines, breaking down the picture into individual columns and then displaying every other line at a very high rate – at 1/25th of a second. Odd-numbered lines get painted on the screen first, then even numbered lines. While this is incredibly fast and impossible for the human eye to detect it.
Progressive scan renders images sequentially, all at once. This makes for a much smoother image overall.

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