4K (Ultra HD)
What's All the Fuss Over 4K?
If you've recently been looking at new cameras, you'll probably noticed the term '4K video' pasted on store camera displays and even on labels affixed to the camera fronts. 4K is a video designation that literally translates to '4,000'. The name comes from the approximately 4,000 pixels in display width.
This is much more detail than any specification than any you've seen before. Perhaps, you've already observed the jump from pre-digital 'standard definition' television to 'HD' then to 'Full HD' benefits that are now possible on digital TV, Blu-Ray discs and streaming on-line. Compared to early standards, this HD footage is developed, crisp and ieven looks excellent when seen on a large TV. However even the best quality, '1080p' HD video is only 1920 pixels across. 4K contains significant more detail, since it has double the horizontally pixels, and four times the total pixels.
Technology doesn't stand wait for for anyone and the a new video standard is now 4K.
The 4K label is used to express a couple different, although very similar, standards. The articulation you're most likely come across is Ultra High Definition or UHD, the new 4K TV standard. 4K video is positioned to become the new benchmark for both capturing and viewing video and it brings a whole host of instant advantages.
Obtain Additional Video Clarity
The images below represent the in detail contrast between various video resolutions. Video captured using a
D500 DSLR Camera.
Standard Definition (480p)
Digital cameras 2000's and TVs, late 90s / early 2000s. Can't make out much,
High Definition / HD (720p)
A few contemporary digital cameras provide slow motion video at this resolution.
Full HD (1080p)
Most contemporary digital cameras record at this resolution.
Few cameras capture 4K video recording but when you can, the footage is
fabulously sharp compared to 1080p.
What 4K means for Video Photographers
If you are shooting video in HD, you should upgrade to a 4K to a 4K-capable camera? The obvious answer to switch to 4K is to prepare your work for the future.
We don't even use 1080p!
Consumers may not insist on 4K content today, but at some point in the future they will, and if there's any lesson in history, this will probably occur soon. Just envision if everyone continued to shoot standard definition up until the moment that everyone had an HD TV at last. No one wants to view that snowy, grainy low-resolution content today? As a content creator it's always better getting out in front of the curve.
However, even if you don't require (or even want) to acquire 4K content yet, there are number of huge advantages to adopting the 4K standard now.
Improved 1080 HD Footage
Shooting 4K will make your HD video appear better. Most of today's HD cameras
capture great 1080p video, quality, but when you start with 4K source images and
downscale it to HD resolution the image will look even better, thanks to each
pixel effectively being over sampled by a factor of four. In addition to
clearer, crisper images, color data is improved and easier to grade, and common
video artifacts like moiré are significantly diminished or even eliminated
thanks to the higher resolution original image.
Cropping / Zooming / Panning
4K capture also makes it possible to benefit from editing techniques that would
be impractical - or at least not easy - with typical HD footage. Need to crop in
tight on an image you captured? No issue - you can crop as miuch as 4x on 4K
footage and still keep full HD video resolution. Similarly, all those additional
pixels let you zoom in, out, or even pan over an image while keeping HD
Creating Still Images from Video
Have you ever shot a video, only to later decide that you need a still image for
a marketing or advertising campaign? 4K to the rescue. Although it has only
double the horizontal lines as HD video, 4K footage contains four times the
total resolution over HD. While you can muster out a 2 megapixel still image
from standard HD video footage, that's not enough resolution to be useful for
anything much past use online. 4K, however, gives you the capacity to extract an
~8MP image straight from your video. That's enough for a decent size print or
even an a magazine ad
Stabilizing Your Images
All those additional pixels also come in handy to stabilize your videos. Most non-linear editors, like Adobe Premiere Pro along with Apple Final Cut Pro X, feature image stabilization algorithms that do an exceptionally good job of simulating stabilizing of handheld footage and making it appear that you used a Steadicam. Regrettably, this process reduces the resolution of the video by strategically scaling, rotating and cropping your video frame-by-frame to counteract camera shake. If you're begining with HD source material this means that the ensuing video may be obviously less sharp, as you're cropping out needed pixels. If you're beginning from 4K, however, you have a momemtous amount of additional pixels to play with. Stabilize away!
Shooting in front of a green screen is a universal video technique that allows editors to merge a foreground object or subject, such as a person, with a diverse background. This process, called chroma keying, becomes much easier the more pixels there are. If you have 4x the pixel density in your source video, it will obviously be better.
4K Video for Still Photographers
How could a video mode ever be useable for still photography you ask? Well, think of it as a way of capturing 24, 25 or 30 eight MP images each second and you might begin to grasp the appeal. Whether it's the brief smile after a child blows out the candles on their birthday cake or the score of a match-winning goal, this shooting process can help make sure you capture the absolute moment.
Panasonic's 4K Photo mode lets you select the right still image direct from the 4K footage.
Image by Panasonic.
Many present day cameras allow you to extract frames from video footage while in playback mode, and some let you press the shutter button during recording, to mark which
frames you want to capture as stills.
Several Panasonic cameras take this a step further using a dedicated '4K Photo' mode that lets you capture footage in more customary aspect ratios, rather than being fixed in the panoramic format of most video. Some cameras even include intelligent functions to help you acquire the moment, such as a pre-record mode that continually record footage, then saves those 30 frames before and after you press the shutter button.
It's entirely possible to extract great images from 4K footage from any camera, but if you're acquiring video with the explicit resolve of capturing stills, your images will benefit greatly from some settings adjustments and technique. As always the case in photography, time spent experimenting is never time wasted.
Increase the likelihood of keepers shooting at 30fps
4K video at 30fps: In just 1 second of 4K video you can capture 30 photos. Fast-paced racecars are tough subjects to properly frame, and with so many photos to choose from, the probability is greater that you'll get a keeper.
Shot with a Panasonic LUMIX DMC-G7
Opportunities are missed using slower bursts
Burst modes on most cameras are 5-8 frames per second: Most consumer digital cameras only have the ability to shoot 5-8 pictures in a second, way slower than 4K. You might get obtain or two good photo with plenty of practice and timing, however multiple photos within the same sequence is nearly improbable.
Upgrading to 4K
As great as 4K is, the extra resolution could require you to upgrade parts of, or potentially your entire photography pipeline which could include memory cards, monitors, hard drives, computers, cameras, and possibly even lenses.
March 28, 2016