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HD or High Definition, the new gold standard for image resolution is often being used interchangeably with ‘Full HD’ to describe a product’s image resolution- but it has only led to confusion. Let’s attempt to clear this. The concept of HD has completely changed the level of visual detail and clarity we’ve come to expect from our screens.

Full HD is a term used to denote the resolution of the TV screen. It basically means an image with a resolution of 1920 by 1080 pixels. The measurement of the number of pixels is done by estimating the height and width. So, if a display unit like a TV holds 1920 x 1080p resolution then, it means its height is 1080 pixels and the width is 1920 pixels and the total number of pixels this resolution can carry is 1920 x 1080 = 2073600 pixels. The more the number of pixels, the better picture quality is as the number of pixels together compose a picture on the TV. This resolution is commonly seen in widescreen TVs or monitors with an aspect ratio of 16:9.

On the upper end of the spectrum, there is Ultra HD (UHD or 4K). This image resolution is larger, crisper, and clearer than even 1080p. However, the Ultra HD image resolution hasn’t yet been universally adopted. Why? Although in technical terms “4K” means a horizontal resolution of pixels containing 4096 pixels, there’s no vertical resolution specified for it. So, Ultra HD TV’s are not technically 4K.

Read: 4K vs HDR vs Dolby Vision.

The primarily difference between HD Ready resolution and Full HD Resolution refers to the actual image size. HD may refer to 720p or 1080p, but Full HD can only refer to 1080p. On the other hand, the phrase HD Ready refers to just 720p. So, when the term ‘HD Ready’ is used to describe a television or monitor/laptop/PC, it means the device has an image resolution of 720p. The term ‘HD’ may also be used. As such, HD Ready image resolution will contain 720 lines of pixels along the vertical axis, and 1,280 lines of pixels along the horizontal axis thereby making the image is 720 pixels tall and 1,280 pixels wide.

This will results in a total pixel count of 921,600, the lowest image resolution that can be considered as high definition.

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