Shift 4 has produced a handy guide “Everything you need to know about High Dynamic Range“. For the full article link go here.
“Enriched pictures with more immersive and vivid colours, extended contrast, deeper shadows and brighter highlights. Sounds pretty good? Well, that’s what High Dynamic Range can bring.
It’s the biggest thing in our industry at the moment and is soon to revolutionise all parts of production. You really need to know about it in full.
Here, Shift 4’s Technical Director Colin Coomber discusses exactly what defines HDR, how it impacts on production processes and what it means for your equipment hire decisions.
The nature of HDR and the full explanation of it here means things are gonna get technical. We’ve broken it down into sections with handy headers; if you’ve had your fill, get it and want to move on, or it’s just all too much, scroll on to the next header.
What is HDR anyway?
High Dynamic Range concerns both image capture and image display and, to fully understand it, a grip on the specifics of how cameras and displays work together is required.
In the simplest terms, a digital camera’s dynamic range is the total range from the darkest shadow to the brightest highlight that it can resolve in a single shot. It’s measured in stops; the more stops of light that a camera’s sensor can see, the higher the dynamic range. (Modern cameras capture a dynamic range of 14-16 stops when shooting in Log).
Monitors follow recommendations that set out exactly how they should display colours and brightness. Rec709 HDTV (short for ITU-R Recommendations, Broadcast Television, number 709), otherwise known as SDR or Standard Dynamic Range, came into being 20 years ago and recommended that monitors should display 6 stops of linear, uncompressed dynamic range with a peak brightness of 100 NITs. This was based on the lowest performing technology at the time: CRT (cathode ray tube) screens. Since then technology has moved on significantly: monitors can now display more colour gamut and luminance and cameras are capable of capturing more too – which is where HDR comes in.
High Dynamic Range, then, is a new way of capturing images and displaying them, with contrast, colour and luminance capable of producing an overall highlight brightness level of more than 1,000 NITs. This blows SDR out of the water which, by comparison, has a maximum brightness of 100 NITs. Rather than the outdated Rec709 colour space, HDR, at its maximum, uses Rec2020.
Contine reading the article – go here. Courtesy of Shift 4