27 Feb 2015

This may be the best "affordable" 4K monitor we've seen. If you make films, you should read this.

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Eizo CG318 4K Monitor Eizo CG318 4K Monitor Eizo / RedShark News

Index

RedShark Technical Editor, Phil Rhodes, reviews the ColorEdge CG318 32in 4K monitor from Eizo and determines its suitability for film professionals and whether it's worth the hefty price tag. The clue is in the title...

Monitoring 4K, in any sense that's accurate according to one of the principal standards for film and TV work, is currently a problem without a huge variety of solutions. Recent headline-grabbers include Sony's thirty-inch PVM-X300 and, based on this example, it'd be easy to be lulled into the idea that only OLED displays (or possibly 3-chip DLP projection as found in full scale cinema installations) are acceptable. The ColorEdge CG318-4K appears to be Eizo's play for both its traditional market of particularly exacting stills photographers and for that part of the film and TV business that doesn't necessarily want to put five figures into the Sony PVM-X300. To drop only a minor spoiler, the results are rather special.

Eizo_logo.JPG

Eizo has had an enviable profile among print and design people for a while, famous for displays which achieve more or less everything that the underlying technology possibly can. The CG318 doesn't (can't) have the same contrast ratio as an OLED, but it really does have absolutely everything else. The basic spec list is a worthwhile place to start: with a full 4096 pixels per line, it's a display of about 1.9:1 aspect ratio and capable of displaying not only the most enormous workstation desktops but also a full digital cinema 4K image, not just 3840-wide quad HD as with many monitors described more casually as 4K. Perhaps more importantly, the sheer physical size of the thing, at the best part of 32 diagonal inches, begins to make 4K readily viewable in a way that 24" quad-HD displays only really do if we lean in and squint.

Impressive contrast

The thing is, figures near £3000 are mentioned, which is potentially a lot for a monitor when Dell's UltraSharp 32 display, at less than half the price, is also an option. In the end, though, the CG318 starts making Dell look quite expensive, given the yawning gap in feature set. For a start, Eizo mentions a 1500:1 contrast ratio; this is both technologically feasible for a very high quality IPS TFT and readily believable in practice.

Just as a subjective observation, the amount of contrast from the CG318 is literally eye-watering. Selecting the sRGB preset, (much more about sRGB below) and cranking up the variable backlight theoretically puts the monitor way out of calibration, but boy, does it look pretty to the untrained observer. Just as a demonstration of sheer dynamic range, this setup produces a display which doesn't even begin to approach the sheer power of Dolby's HDR displays, but suggest what a practical, affordable home-user version of it might look like. In a darkened room, sunset shots are squintingly bright and blacks remain solid. The backlight only goes up to 300 candela per square metre, which is pretty normal for desktop displays, but the point is that the CG318 serves as a particularly keen example of something that's increasingly well-understood as time goes by: dynamic range isn't really about maximum white brightness, it's at least as much about minimum black brightness.

What's your angle?

While we're discussing contrast, we should talk about viewing angles. Naturally, as a TFT panel, the off-axis performance of the CG318 does vary very slightly. Within that limitation, though, performance is very good. The display enjoys a wide range of viewing angles with consistent colorimetry. Beyond that range, the image just seems to dim slightly, with none of the purplish or whitish glare that becomes obvious on many other IPS TFTs.

Colourspaces

So far, so good; the Eizo CG318 is an exceptionally good full-4K, high contrast TFT monitor, which at £3000 probably wouldn't raise too many eyebrows. What makes the display particularly interesting for film and TV people, however, is that unlike a lot of cheaper options, it has built-in support for not only sRGB and Adobe RGB, but also Rec. 709, Rec. 2020, SMPTE-C and DCI-P3 colourspaces.

Eizo_colour_options_closeup.JPG

The monitor covers 98% of the vast P3 colourspace used for digital cinema work. It is therefore suitable for more or less immediate deployment as a reference display in edit suites and grading facilities, producing anything from Rec. 709 material for current broadcast workflows through to digital cinema mastering.

Other than buying one of the 4K OLEDs, this is something that could be emulated to some extent using a lower-cost TFT designed to display Adobe RGB, plus some sort of colour correction device such as a Fujifilm IS-mini, or an HDLink 4K, should Blackmagic release one. Even so, the total cost of doing this might well begin to approach the value of the CG318 and the results would almost certainly not be as good, given the high performance of the TFT panel and backlight that form the basis of Eizo's display.



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Phil Rhodes

Phil Rhodes is a Cinematographer, Technologist, Writer and above all Communicator. Never afraid to speak his mind, and always worth listening to, he's a frequent contributor to RedShark.

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