SpectraCal CalMAN 2018 Ultimate Testing
CalMAN Ultimate is the master product for all other CalMAN software combined. It has by far the most workflows and most extensive hardware support of any CalMAN software and is licensed for use by professional calibrators, large production houses, corporations, and display reviewers. CalMAN Ultimate also allows users to create custom workflows tailored specifically to their own calibration needs.
- Optimize display settings for brightness, contrast, and resolution
- Achieve optimal colorspace and gamma targets
- Conduct CMS (color management system) and multipoint grayscale calibrations
- Analyze display performance with an advanced Quick Analysis Workflow
- Create comprehensive Customer Reports for each calibration
- Automate the calibration process with AutoCal™ Technology for select display models
- Access display settings through DDC (direct display control) with supported display models
- Generate 3D LUTs for select home theater video processors and studio reference monitors
- Calibrate computer monitors with ICC+™ Technology from CalMAN RGB
- Calibrate multi-panel video walls with the new Display Matching workflow.
- Calibrate home theaters, studios, and commercial displays for hundreds of customers, no purchase of additional software licenses necessary
- Create customized reports and workflows in Design Mode
We will be testing with the Datacolor Spyder 5 Colorimeter. This is an affordable colorimeter capable of working with light levels up to 5000 Nits, plenty to test this screen at its maximum HDR brightness.
This section of testing is also performed with the monitor running from an AMD Radeon RX550 GPU. Nvidia consumer class cards such as the GeForce GTX and RTX family are limited to 8-bit color unless running a full-screen Direct X program like most games when running Microsoft Windows. Nvidia professional series cards such as the Quadro family do not have this limitation, nor does any AMD Radeon GPU. The good news here is that this monitor is aimed at gamers, and games can take advantage of a 10-bit color depth, which is the makings of some very nice visuals when coupled with HDR. https://nvidia.custhelp.com/app/answers/detail/a_id/3011/~/10-bit-per-color-support-on-nvidia-geforce-gpus
Wide Gamut Color mode enabled from OSD, but this is the factory calibrated ‘out-of-the-box’ performance and running at native 3840x2160 Resolution and 98Hz to avoid Chroma sub-sampling.
9-Point Screen Uniformity:
This test measures the difference between the center of the screen out the various other areas. A DeltaE of 3.0 or less is considered good, and a DeltaE of less than 1.0 is considered to be a difference imperceptible to the human eye. This test shows us that the ROG Swift does a solid job keeping things even across it’s 27” screen, but the eagle-eyed among us may be able to notice a slight difference from the left and upper left edges of the monitor compared to the center.
Screen Angularity Measurement
The angularity test measures the display at different angles to measure chromaticity and luminance shifts off axis. We measure the primary and secondary colors in addition to white and 75% grey. This gives us a solid view of issues. Typically, this would be measured with a spectrophotometer at +/- 10° and +/-15° from perpendicular, but we are using a colorimeter at five points across the screen horizontally to detect shifts in color reproduction.
We see that the blue primary color is pretty even across the screen, but red shifts noticeably on the left edge, along with green which skews white toward the cool end of the spectrum. Again, this is a very small shift, but the most color sensitive viewers might be able to pick out a difference in some circumstances. The vast majority of users will never notice though.
X-rite / Pantone ColorChecker Targets.
This test checks for color reproductions of things you would see in the real world such as human skin tones, foliage and flowers and is used as a color reproduction standard for photography and cinema.
ASUS’s ROG Swift PG27U does a respectable job here with an average DeltaE of 2.33, good enough for all but the most intense color accurate work. Asus claims a color accuracy of equal or less than a DeltaE of 3, and we are averaging below that quite easily.
Color Saturation Sweep
This test checks each of the three primaries (Red, Blue, Green) and three secondaries (Cyan, Magenta, Yellow) colors for saturation at 20,40,60,80 and 100% saturation.
The Swift monitor again does a really good job out of the box by holding an average DeltaE of just over 2, again, well below Asus’s claimed △E≦ 3.
If the ROG Swift PG27U has great color reproduction, it is nothing compared to it’s black and white accuracy. With an average DeltaE of 0.4, most of which comes from the very darkest end of the sweep, the accuracy here is legendary. An average color temperature of 6486K is just imperceivably warmer than the standard 6500K target which means the ROG Swift holds a nice neutral white with no visually noticeable warm or cool shift from black to pure 100% white. Excellent!
This test shows how stable the backlighting system is when displaying a very small amount of white up to a full screen 100% white background. We see a deviation of about 5 nits from 2% white to 100% white screen coverage which is great.
This test shows how long the backlighting system can maintain a stable level of illumination. Over about an hour and hundreds of test samples, the backlight is very stable and maintains its SDR brightness of 301 nits quite perfectly with almost zero deviation. Cheaper backlight systems may only be able to maintain peak brightness for a limited amount of time before sagging, but not the ROG Swift.
Standard Color Volume
Here we see the ROG Swift PG27U actually exceeding its specs by a fair margin. The monitor claims to have 97% of the DCI-P3 color space but we actually measured just over 110%
Perceptual Color Volume
The lCtCp Color space is a more recent metric designed to measure Ultra High Definition displays such as 4KUHD and 8KUHD and beyond while considering the capabilities of Wide Color Gamut and High Dynamic Range. This metric is given in millions of distinguishable colors (MDC). While 10-bit color can mathematically display just over a staggering 1 Billion colors, we measured an MDC value of 167.564. This means the display in its current state can display around 167,564,000 different discernable colors.