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AOC I2757Fh And ViewSonic VX2770Smh: Two 27" IPS Monitors

Results: Gamma And ANSI Contrast Ratio

Gamma

Gamma is the measurement of luminance levels at every step in the brightness range from 0 to 100 percent. This is important because a poor gamma can either crush detail at various points, or wash it out, making the entire picture appear flat and dull. Correct gamma produces a more three-dimensional image, with greater depth and pop. Meanwhile, incorrect gamma can negatively affect image quality even in monitors with high contrast ratios.

We took gamma measurements at eleven different brightness levels from 0 to 100 percent. An average value of 2.2 is the best match for video and gaming content. Since gamma is a new metric for us, we don’t have any historical data available for comparison.

AOC performs slightly better in this measurement, staying closer to its average value of 2.2. Of the three gamma presets on the I2757Fh, the default gamma 1 setting is the best; the other two are a good deal off the mark.

Because some monitors fluctuate at different points in the brightness range, we also include the range of gamma values. A lower range number indicates superior gamma tracking.

While ViewSonic doesn’t offer any gamma controls on the VX27770Smh, the measurements are only slightly less accurate than the AOC panel.

ANSI Contrast Ratio

Another important measure of contrast is ANSI. While we haven’t previously included this benchmark, it will appear in this and all future monitor reviews. To perform this test, a checkerboard of sixteen 0 and 100 percent squares are measured. This is somewhat more real-world than on/off measurements because it tests a display’s ability to simultaneously maintain both low black and full white levels, and factors in screen uniformity. The average of the eight full-white measurements is divided by the average of the eight full-black measurements to arrive at the ANSI result.

Once again, ViewSonic maintains its lead in the contrast category.

  • 1920x1080?

    Next.
    Reply
  • kinggremlin
    Unless you're legally blind, why would anyone want a 27" 1920x1080 monitor? I still don't get why one industry thinks we need 1920x1080 on a 5" cell phone, while another thinks 1920x1080 is all the resolution you'll ever need no matter how big your screen.
    Reply
  • Nintendo Maniac 64
    In other news, Micro Center and Monoprice have 27" monitors @ 2560x1440 for just under $400, both of which are based off the inexpensive 27" Korean monitors but come with a US warranty:

    Micro Center - AURIA EQ276W 27" IPS LED Monitor @ $399.99Monoprice - 27" IPS LED CrystalPro Monitor WQHD @ $390.60
    Surely that's the comparison readers really want to see. Get on it Tom's!
    Reply
  • I bought myself Achieva Shimian QH270-Lite on ebay and it is a 2560x1440 monitor with 6ms response time. Its basically a rejected apple monitor with no frills and no warranty (sold in Korea for $200). I doubt monitor manufactures will release 2560x1440 monitors at mainstream prices within the end of this year, as Intel predicted. Or 4k monitors by 2015.

    Here are some links to sites dedicated to these 27" 2560x1440 monitors:

    http://www.overclock.net/t/1215866/reviewed-400-2560x1440-ips-no-ag-90hz-achieva-shimian-qh270-and-catleap-q270
    http://hardforum.com/showthread.php?s=555ec44784c7ce14633a870f574d2b48&t=1675393
    http://www.overclock.net/t/1228062/achieva-shimian-monitor-club

    If you you would like to know more how your graphics card, monitor perform on 1440P and above resolution with certain games, go to to this link:

    http://www.overclock.net/t/1291882/1440p-and-above-gaming-club-1440p/0_100
    Reply
  • grokem
    Thanks for the review. These do look like very good choices for those that don't need a gaming monitor. No offense to this review as I do think it serves a purpose and will be useful to many. However, I think I'm going to quit reading monitor reviews for a couple of years. Maybe by then my 15 year old monitor and my 10 year old ~$500 LCD will be surpassed by something new and better.
    Reply
  • Nintendo Maniac 64
    10448090 said:
    However, I think I'm going to quit reading monitor reviews for a couple of years. Maybe by then my 15 year old monitor and my 10 year old ~$500 LCD will be surpassed by something new and better.
    They already have been surpassed, but the tech is expensive currently:
    Sony PVM2541 25-inch Professional OLED Picture Monitor
    Reply
  • bavman
    Pass. 27'' is way to big for 1080p, needs 1440 at the minimum.

    Manufactures need to stop making 1080p monitors. With 4k around the corner, it should be at least 1440 or 1600 now. Were not gonna get anywhere until someone finally starts to really mass produce higher res monitors
    Reply
  • abbadon_34
    Remember when CRT's supported tons of resolutions and refresh rates, more than most could handle? Then trendiness and HDCP got in the way.
    Reply
  • zander1983
    Nintendo Maniac 64They already have been surpassed, but the tech is expensive currently:Sony PVM2541 25-inch Professional OLED Picture Monitor
    Still 1080p, pass.
    Reply
  • Nintendo Maniac 64
    10448091 said:
    They already have been surpassed, but the tech is expensive currently:
    Sony PVM2541 25-inch Professional OLED Picture Monitor
    10448095 said:
    Still 1080p, pass.

    It's a 24" monitor, what did you expect? (they market it at 25" but it's really 24 5/8")

    If they come out with a 27-30" monitor, surely it'd be 2560px wide since they are professional-level displays.
    Reply