HDR is a technical term that, in recent years a little bit crept in. What is HDR actually, what is the difference between the HDR photos and HDR videos, and how to view you?
HDR is a term used especially by photographers all longer known. It is an abbreviation which stands for high dynamic range. Which term describes images with a greater difference between the darkest and the lightest part on the preset frame.
It is a term that is used for photography for a property of tv programs, movies and series. And that is confusing, because HDR photography is something very different than HDR in videos.
HDR photography: realistic to hyper-realistic photos
HDR is to photography used as the name for pictures that have more light range capture than standard is possible with a single photo. Cameras have a less wide range than the human eye. Take a photo of the setting sun: often it is underexposed which makes the photo darker appearance than the reality or is it entirely correct overexposed. The camera captures something else than your eyes have seen.
To solve this problem, is the HDR image created. Be in quick succession two or more images under different exposures. The dark parts of the scene than on the overexposed photo good to see, while the air just at the underexposed photo pretty true. Add those beautiful parts together into one picture and you have a HDR-photo. Photographers often make so-called hyper-real HDR photos: images that have a larger light range than the human eye can absorb. Such photos get a dreamy effect.
A hyper-realistic HDR image gives a dreamy effect:
A few years ago was the creation of HDR photos still partly by hand and had digital photos later with special software to be merged to one HDR picture. Now, every smartphone HDR photos, mostly fully automatic. The unit sees that the user a picture of a scene with great contrast and with little or no light then turn on HDR in. There are multiple photos and automatically merged, and the result is an HDR image that more differences between light and dark shows.
But what is the difference between HDR photo and HDR video?
HDR is in fact a trick to enhance the photos to make under complicated circumstances. An HDR photo is, in principle, not different on a screen than when printed. HDR video is a whole different story.
HDR videos are images that are created specially for HDR tvs that they can show you. Certainly recent 4K tv’s support in the rule also HDR. That technique is in recent years rise, because the display of HDR video’s only in the last few years on a commercial scale is possible.
In short is HDR for tv’s in two parts. On the one hand you have images that are included with the latest cameras, which are capable of much more colours and contrast to catch. On the other hand you have the images on the basis of one of the various HDR standards are suitable made for tv’s that they can play. Using the HDR-standards-tell the videos how to tv’s, the images should be displaying.
What does a tv need to HDR images to show?
Tv’s have screens that are becoming fiercer, one of the conditions for the display of HDR. Also have the scenes, a still greater contrast: at the same time all the light and dark elements to show. Add the two possibilities together and you can show with shadows full of details, with at the same time, a sun in the picture who actually brighter shining than the rest of the image.
The contrast is especially high in oled: those screens are actually from kleurlampjes individually on and off. The picture Is black, then the lights on that part of the screen. The black is really black, while black, rather dark grey looks on lcd screens because of the ever-burning backlight.
Nonetheless, one can also lcd screens HDR display, this is the technique of local dimming used. There is not one large light box behind an lcd screen, but the backlight is divided into separate pieces that are individually on and off. Not as detailed as for oled, but it saves a lot of.
As the last play of the colours an important role in HDR. Because of the black donderker and the white lighter, there is between those two extremes and more room for a larger color range. Also in colours oledschermen key: the tv’s can have more colors show and the colors eyes often also brighter. Nevertheless, lcd tv’s still each year a little better, especially the more affordable models.
Where are the HDR-standards and why are there multiple?
To make everything not too complicated, we do not go into the HDR-classifications that manufacturers come up with themselves. Every tv maker gives its own name to its HDR technology, depending on the contrast ratio and the color gamut. That ranking say actually not much.
Please note that in place thereof the following three labels: HDR10, HDR10+ and Dolby Vision. These are the three most important standards in the field of HDR-images. Such a standard is necessary to ensure that images on HDR-screen tvs look as the maker intended.
On the basis of the different standards can makers of films and series on tv’s to tell which parts of the image in any way should be displayed and with what intensity. The most commonly used standard is HDR10. Because it is an open standard, the use free and is the by all HDR tv’s supported. The technology makes it possible to have the HDR settings on a per scene or camerashot.
Dolby Vision is more technically advanced: filmmakers can than image for image transmission how images should be displayed. Also, there is more room for details, so that light and color gradients more subtle, can be applied. Therefore, even within a single camerashot large differences can be shown, which makes for even more realistic images.
The disadvantage of Dolby Vision is that the use of money costs. Both content creators and tv manufacturers have to charge licensing fees to Dolby to pay. Some manufacturers like Samsung want to that cost, not pass it on to the user. Therefore, to support the tv’s from Samsung not Dolby Vision. The group would prefer the open standard HDR10+ large. HDR10+ also makes it possible to a picture to indicate how that is to be displayed. Currently Dolby Vision is a lot more popular than HDR10+.
Who offer HDR images?
HDR images are primarily through video streaming. YouTube and Netflix are together probably the largest providers of HDR videos. Especially Netflix supports the technique considerably: many of the Netflix Originals series and movies support HDR10 or Dolby Vision. Also Amazon Prime Video supports those standards.
Movies in HDR to rent or buy, is more complicated. In the Netherlands there are but two parties to movies in HDR digital rent and sell: Apple and Rakuten TV. To those movies through Apple, yet is a 4K Apple TV, a separate set-top box that 199 euro cost. Rakuten TV is there as an app for tv’s from Samsung, LG, Panasonic and Sony.
Samsung, Sony and LG offer in the course of 2019, however, new tvs with support for AirPlay 2, the streamingstandaard of Apple. With AirPlay 2 users can from iTunes on their iPhone or iPad to rent movies and stream it to their new tv in 4K HDR. Tv’s from Samsung even get a built-in iTunes app for renting and purchasing 4K HDR movies.
The look of HDR movies from discs is also possible. The latest ultra-hd Blu-ray movies support 4K. This is a ultra-hd-Blu-ray-player. The discs are also relatively expensive: the films cost 30 euros or more, seasons of series are even more expensive.
At present, it is HDR not yet supported by the Dutch tv providers. That broadcast in full hd. The first experiments with broadcasting in 4K resolution are only just starting. It takes probably a few years before the providers, the support of HDR at all for testing.