Sign in with
Sign up | Sign in

Measurement and Calibration Methodology: How We Test

BenQ BL3200PT Review: A 32-Inch AMVA Monitor At 2560x1440
By

To measure and calibrate monitors, we use an i1Pro spectrophotometer, a Spectracal C6 colorimeter, and version 5.2.0.1374 of SpectraCal’s CalMAN software.

The i1Pro is accurate and consistent measuring color on all types of displays, regardless of the backlight technology used. When we just need a luminance value, the C6 works better, especially in low light.

For patterns, we employ AccuPel DVG-5000 and DVDO AVLab TPG video signal generators. This approach removes video cards and drivers from the signal chain, allowing the display to receive true reference patterns. Connections are made via HDMI.

The AccuPel DVG-5000 is capable of generating all types of video signals at any resolution and refresh rate up to 1920x1080 at 60 Hz. It can also display motion patterns to evaluate a monitor's video processing capabilities, with 3D patterns available in every format. This allows us to measure color and grayscale performance, crosstalk, and ghosting in 3D content via the 3D glasses.

The DVDO generator is a new addition to our lab. It supports resolutions up to 4096x2160. We’re using it to verify the proper signal handling of QHD and UHD displays.

The i1Pro or C6 is placed at the center of the screen (unless we’re measuring uniformity) and sealed against it to block out any ambient light. The AccuPel pattern generator (bottom-left) is controlled over USB by CalMAN, which is running on the Dell XPS laptop on the right.

Our version of CalMAN Ultimate allows me to design all of the screens and workflows to best suit the purpose at hand. To that end, I’ve created a display review workflow from scratch. This way, we can be sure and collect all the necessary data with a concise and efficient set of measurements.

The charts show us the RGB levels, gamma response, and Delta E error for every brightness point from zero to 100 percent. The table shows us the raw data for each measurement. And the area in the upper-left tells us luminance, average gamma, Delta E, and contrast ratio. The individual charts can be copied to the Windows clipboard to easily create graphics for our reviews.

Every primary and secondary color is measured at 20-, 40-, 60-, 80-, and 100-percent saturation. The color saturation level is simply the distance from the white point on the CIE chart. You can see the targets moving out from white in a straight line. The further a point is from center, the greater the saturation until you hit 100 percent at the edge of the gamut triangle. This shows us the display’s response at a cross-section of color points. Many monitors score well when only the 100-percent saturations are measured. Hitting the targets at the lower saturations is more difficult, and factors into our average Delta E value (which explains why our Delta E values are sometimes higher than those reported by other publications).

Add a comment
Ask a Category Expert
React To This Article

Create a new thread in the Reviews comments forum about this subject

Example: Notebook, Android, SSD hard drive

Display all 30 comments.
  • 2 Hide
    npyrhone , August 26, 2014 8:21 AM
    "Remember that 92 ppi number we mentioned at the beginning of today's story? That seems to be a sweet spot. It works fine at 24 inches if your screen is FHD. You won’t discern individual pixels, but you’ll be quickly wishing for more screen real estate. Moving up to 2560x1440 at 27 inches increases density to 109 ppi. That’s great for gaming and photo work. However, text and small objects become difficult to see for many users."

    I can't understand why I would need a monitor with lower pixel density? Why not just zoom the text a notch in your word processor or whatever software you are using? Of two otherwise similar monitors I would always choose the one with higher PPI, even if I used it only for word processing.
  • 0 Hide
    kid-mid , August 26, 2014 8:24 AM
    I rather have the 27" QNIX Evo II 1440p for $300 or the ROG Swift for $600.
    The days of 60Hz are almost over with..
  • 0 Hide
    moogleslam , August 26, 2014 8:34 AM
    Quote:
    I rather have the 27" QNIX Evo II 1440p for $300 or the ROG Swift for $600.
    The days of 60Hz are almost over with..

    Except that the Swift cost $800
  • 0 Hide
    moogleslam , August 26, 2014 8:35 AM
    The Swift cost $800
  • 0 Hide
    Merry_Blind , August 26, 2014 8:39 AM
    "The only complaint we’ve registered along the way involves font size. With a pixel density of 109 ppi, text in most Windows applications becomes pretty small."

    That's why I don't understand people saying 1080p is crap and has to go away. I've always find that even at 1080p, the fonts are really small, and icons and interfaces in general are very tiny. In my case, it's not even a case of not being able to read, it's just that everything looks so out of place and hideous, like, Windows wasn't meant for such resolutions.
    I can't imagine 1440p. Must be ridiculous to look at. It's just aesthetically not nice.
    Bring on the downvotes...
  • -5 Hide
    animalosity , August 26, 2014 8:50 AM
    Why in God's green earth would you pay $1000 for a 1440p display at 60hz when you can get a 4K for way less than that now. Rather have UHD....
  • 1 Hide
    Bondfc11 , August 26, 2014 8:52 AM
    I agree with npyrhone - there are ways to enlarge everything on your screen if the density is too low. Having said that - this is an interesting panel. However, I cannot wait for the days when not TNs, but also IPS and VA panels (in large formats) become standard at 120Hz. The hertz do make a noticeable difference in everything you do on the screen.
  • -2 Hide
    ohim , August 26, 2014 9:04 AM
    I`ll wait to see what Active Sync monitors will be able to do , an IPS with Active sync over a TN with 144hz.
  • 1 Hide
    Merry_Blind , August 26, 2014 9:19 AM
    Quote:
    I`ll wait to see what Active Sync monitors will be able to do , an IPS with Active sync over a TN with 144hz.

    What is Active Sync?
  • 2 Hide
    Merry_Blind , August 26, 2014 9:20 AM
    Quote:
    Why in God's green earth would you pay $1000 for a 1440p display at 60hz when you can get a 4K for way less than that now. Rather have UHD....

    It's not 1000$ though...
  • 0 Hide
    Chris Droste , August 26, 2014 9:34 AM
    it's always depressing nowadays with monitors. I have a Samsung 23" with 2048x1152 (>1080p) and for like... $240 when i got it? now you can't have anything above 1080p unless you want 26+ inches and don't mind shelling out +$400 (nevermind korean grey-market monitors) i understand the whole film standard stuff but i LOVE just that small extra bit of real estate on ONE Monitor.
  • 4 Hide
    Bondfc11 , August 26, 2014 9:47 AM
    Quote:
    Why in God's green earth would you pay $1000 for a 1440p display at 60hz when you can get a 4K for way less than that now. Rather have UHD....


    Part of the reason people do comes down to one, the pixel density (if that matters) and two the GPU horsepower necessary to run it. 4K panels are cool, but I don't game on one at all. I have one, but it isn't my go to monitor due to the low refresh rate, lag, and blur. Is it pretty? Sure. But honestly right now that 28" 4K panel is dumb as a post.
  • 1 Hide
    lelias2k , August 26, 2014 10:53 AM
    I'll add my two cents regarding less PPI.

    I'm always amazed how most people don't know you can adjust the size of pretty much every font inside of Windows. I've had people lowering the resolution of the screen and seeing everything blurred until I showed them that you can adjust the font sizes.

    But for TH to make a comment like that? Did BenQ's marketing department sent you the text ready?
  • 4 Hide
    oxiide , August 26, 2014 11:04 AM
    Quote:
    "Remember that 92 ppi number we mentioned at the beginning of today's story? That seems to be a sweet spot. It works fine at 24 inches if your screen is FHD. You won’t discern individual pixels, but you’ll be quickly wishing for more screen real estate. Moving up to 2560x1440 at 27 inches increases density to 109 ppi. That’s great for gaming and photo work. However, text and small objects become difficult to see for many users."

    I can't understand why I would need a monitor with lower pixel density? Why not just zoom the text a notch in your word processor or whatever software you are using? Of two otherwise similar monitors I would always choose the one with higher PPI, even if I used it only for word processing.

    Its not so much your apps that are the concern, because yes, most of them will give you some scaling options. The issue is that Windows does not scale very far. Your UI (icon text, folder names, Windows Explorer stuff) will be smaller at higher PPI.
  • -2 Hide
    Patrick Tobin , August 26, 2014 11:43 AM
    Quote:
    "The only complaint we’ve registered along the way involves font size. With a pixel density of 109 ppi, text in most Windows applications becomes pretty small."

    That's why I don't understand people saying 1080p is crap and has to go away. I've always find that even at 1080p, the fonts are really small, and icons and interfaces in general are very tiny. In my case, it's not even a case of not being able to read, it's just that everything looks so out of place and hideous, like, Windows wasn't meant for such resolutions.
    I can't imagine 1440p. Must be ridiculous to look at. It's just aesthetically not nice.
    Bring on the downvotes...

    Quote:
    "The only complaint we’ve registered along the way involves font size. With a pixel density of 109 ppi, text in most Windows applications becomes pretty small."

    That's why I don't understand people saying 1080p is crap and has to go away. I've always find that even at 1080p, the fonts are really small, and icons and interfaces in general are very tiny. In my case, it's not even a case of not being able to read, it's just that everything looks so out of place and hideous, like, Windows wasn't meant for such resolutions.
    I can't imagine 1440p. Must be ridiculous to look at. It's just aesthetically not nice.
    Bring on the downvotes...


    Windows 7/8/8.1 has gui scaling as does MacOSX. Non issue.
  • 2 Hide
    luissantos , August 26, 2014 11:44 AM
    Quote:
    I'll add my two cents regarding less PPI.

    I'm always amazed how most people don't know you can adjust the size of pretty much every font inside of Windows. I've had people lowering the resolution of the screen and seeing everything blurred until I showed them that you can adjust the font sizes.

    But for TH to make a comment like that? Did BenQ's marketing department sent you the text ready?


    I am one of the people to whom 1080p @ 24" renders things hard to see (not exclusive to text, mind you).

    I am fully aware of Windows' high-DPI settings. But let me tell you, unless the applications you are running have good built-in support for it, Windows' high-DPI is not going to be a magic bullet.

    You have 2 options: Win XP's high-DPI which will increase font size and leave every GUI element on screen looking highly unbalanced, OR the newest method that scales up the canvas surface upon which everything was rendered before "printing" it on screen, in which case you will also end up with blurriness.

    Trust me on this. I have tried using high-DPI for extended periods of time, not just toggled it on and off so I could tell myself it's there and pretend it works fine. Unless you have a real disability like me though, you may have a hard time understanding where I'm coming from... so no hard feelings.
  • -1 Hide
    anbello262 , August 26, 2014 2:07 PM
    In my case, I REALLY long for the exact opposite: Higher DPI monitors. After using a 120 DPI glossy one (18.4'' FHD), I haven't been able to get over its amazing sharpness and definition... At the moment I have a 24'' FHD anti-glare monitor, and I really, really miss the smaller one... My girlfriend has a 21'' FHD anti-glare monitor, and even that is better than my current one...
    Basically, sharpness of a glossy (or anti reflect, just not anti glare) high DPI monitor is amazing, I just can't get over that... I don't understand why the market is moving away from that...

    By the way, is there any monitor you can reccomend that has this specs? And one that is more than 60HZ?
  • 0 Hide
    LordConrad , August 26, 2014 4:53 PM
    My current monitor is a Dell UltraSharp IPS panel which has amazing color accuracy, but I've always liked the VA panels. Better blacks and faster response times then IPS panels, but better viewing angles than TN panels. I've owned two PVA panels, and while they weren't perfect, I thought they were a good cross between TN and IPS.
  • 0 Hide
    shiitaki , August 26, 2014 5:40 PM
    Quote:
    Quote:
    "Remember that 92 ppi number we mentioned at the beginning of today's story? That seems to be a sweet spot. It works fine at 24 inches if your screen is FHD. You won’t discern individual pixels, but you’ll be quickly wishing for more screen real estate. Moving up to 2560x1440 at 27 inches increases density to 109 ppi. That’s great for gaming and photo work. However, text and small objects become difficult to see for many users."

    I can't understand why I would need a monitor with lower pixel density? Why not just zoom the text a notch in your word processor or whatever software you are using? Of two otherwise similar monitors I would always choose the one with higher PPI, even if I used it only for word processing.

    Its not so much your apps that are the concern, because yes, most of them will give you some scaling options. The issue is that Windows does not scale very far. Your UI (icon text, folder names, Windows Explorer stuff) will be smaller at higher PPI.

  • 1 Hide
    soldier44 , August 26, 2014 7:11 PM
    Waste of res with 1440p Why not go ahead with a 2560 x 1600 stop with the cutting corners on these displays. I used a 30 incher for 4 years now with a 4K beast Asus 32 incher.
Display more comments
React To This Article