Feeds

How to choose the right screen size

Is your telly too small - or too big - for HD?

Intelligent flash storage arrays

Is Full HD really necessary?

As well as asking BBC staff how far they sat from their TV sets, the researchers ran a second set of tests to determine how much detail the human eye can resolve. This was done with a series of test images, and methodology that’s described in some detail in the whitepaper.

Essentially, it involved comparisons between series of filtered and unfiltered images, and the result was broadly in line with the accepted figure of one minute of arc - 1.054, to be precise.

In fact, the BBC research wasn’t strictly concerned with viewing distance, but with what quality of image needed to be broadcast, based on the ability of the eye to discern detail, at the median viewing distance of 2.7m (8.9ft). And the results are quite surprising:

Spotting the Detail
Picture resolution vs screen size

TV Size vs Resolution

Plot resolution (vertical axis) against screen size and, at an average distance of 2.7m, viewers can't see the difference between 1080p and 720p for the most common TVs
Source: BBC

For the vast majority of viewers, a resolution of 1280 x 720 - 720p - will be sufficient for screen sizes of up to 50 inches diagonal, while 1440 x 1080 may suffice 50-56in screens – a figure that may perhaps influence the decision to broadcast some BBC HD services with a horizontal resolution of 1440 rather than 1920 pixels, though it's also to do with maintaining a 4:3 aspect ratio - which contains an anamorphic picture that stretched to the correct dimensions by a widescreen telly.

And if you’re one of those who feels that you’re being short-changed by the picture quality on some channels, or perhaps someone who simply can’t see what all the fuss is about, a second set of results shows the proportion of people in the test who required a specific standard.

At sizes of 35-40in, it seems that up to around 15 per cent per cent of people will notice a higher quality than 720p, though the proportion noticing anything better than 1440 x 1080 doesn’t increase beyond 15 per cent until screen sizes exceed 45in.

Choosing a cloud hosting partner with confidence

Next page: The maths bit

More from The Register

next story
PEAK APPLE: iOS 8 is least popular Cupertino mobile OS in all of HUMAN HISTORY
'Nerd release' finally staggers past 50 per cent adoption
Tim Cook: The classic iPod HAD to DIE, and this is WHY
Apple, er, couldn’t get the parts for HDD models
Apple spent just ONE DOLLAR beefing up the latest iPad Air 2
New iPads look a lot like the old one. There's a reason for that
Google Glassholes are UNDATEABLE – HP exec
You need an emotional connection, says touchy-feely MD... We can do that
Microsoft fitness bands slapped on wrists: All YOUR HEALTH DATA are BELONG TO US
Wearable will deliver 'actionable insights for healthier living'
Lawyers mobilise angry mob against Apple over alleged 2011 Macbook Pro crapness
We suffered 'random bouts of graphical distortion' - fanbois
Caterham Seven 160 review: The Raspberry Pi of motoring
Back to driving's basics with a joyously legal high
prev story

Whitepapers

Why cloud backup?
Combining the latest advancements in disk-based backup with secure, integrated, cloud technologies offer organizations fast and assured recovery of their critical enterprise data.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
Simplify SSL certificate management across the enterprise
Simple steps to take control of SSL across the enterprise, and recommendations for a management platform for full visibility and single-point of control for these Certificates.