The new Asus VG278H 3D Vision-ready 120Hz LCD monitor has an interesting option in the OSD menu that allows you to control the level of the 3D Lightboost and thanks to that I was able to try some interesting things. In the review of the Asus VG278H 3D monitor I have already mentioned that there are some things that you can do in order to improve the results you will get when using the monitor. One example for that is to reduce the Contrast level from the default setting of 76 to 55 in order to reduce the level of ghosting/crosstalk in stereo 3D mode without sacrificing too much of the brightness and that is possible thanks to the 3D Lightboost technology that increases the brightness level. I’ve used a colorimeter to measure the level of brightness with the different settings of the Contrast level with the Lightboost set to the maximum level and here are the results:
Contrast 100: 202 cd/m2
Contrast 76: 160 cd/m2
Contrast 55: 111 cd/m2
And here is the level of brightness with the default setting for Contrast of 76 and different level of the Lightboost setting, from completely off to the maximum:
Off: 85 cd/m2
+1: 90 cd/m2
+2: 95 cd/m2
+3: 102 cd/m2
+4: 111 cd/m2
+5: 120 cd/m2
+6: 128 cd/m2
+7: 136 cd/m2
+8: 144 cd/m2
+9: 152 cd/m2
Max: 160 cd/m2
Notice that from the Off state of the Lightboost technology to the maximum level there is almost a double increase of the brightness level and what Nvidia was saying for the new technology was that it will increase the brightness twice. So you can say that this claim is true. Notice that the level of brightness you get with the decreased Contrast to a setting of 55 is the same as the +4 state of the Lightboost setting together with the default setting for Contrast. So you are kind of halving the effectiveness of the Lightboost technology in order to further reduce ghosting/crosstalk.
In order to further reduce the ghosting in 2D mode as well you can also play with the Trace Free option of the monitor. The default setting of 60 is quite Ok (the left part of the image above), but increasing it to the maximum value of 100 you get better results (the right part of the image above). You can see from the high-speed photos taken from the PixPerAn test software that the fast moving objects are looking better and have less ghosting with a higher value of the Trace Free function.
Tags:3D Crosstalk·3d ghosting·3D Lightboost·3d monitor·Asus VG278H
I’ve prepared two sample stereoscopic 3D photos in a Side by Side (JPS) format for testing the level of crosstalk/ghosting on 3D-capable displays, you can see how the files look like in the small versions above and in order to download the JPS files just right click on them and and select “Save Target As”. As you can see the test photos contain a photo only in one side and the other side is filled with white and black color in order to make the level of crosstalk/ghosting more apparent and easily viewable. Just open the two photos and look only through the left lens (close your right eye) in order to see the part of the image that is “leaking” from the one intended for the other eye. You can take a photo through the left lens and post the results below, just like the following examples…
Here is how the two test photos look like through the 3D Vision glasses’ left lens on a Samsung 2233RZ 3D-capable LCD monitor. As you can see there is ghosting visible with both test photos and there is a bit more at the top and bottom of the screen. The crosstalk you see here is due to the slower response time of the pixels on the screen and it is different due to the difference in transition between the displayed color on the photo and the white and black (the two extremes).
The situation with the test photos on Panasonic Viera VT20E 3D HDTV is a bit different, as there is no visual ghosting seen in the transition to white, but there is some ghosting visible with the transition to black (with some yellowish tint due to the glasses). Generally the plasma TVs have faster response time, but they are not completely ghosting free either, still the situation is better than on 3D LCD monitors as you can see comparing to the results from the Samsung monitor above.
You are also more than welcome to download, try, document the results on your 3D-capable display and then post the photos in the comments below, so that we can get a batter comparison between different 3D computer monitors and 3D TV sets…
Tags:3D Crosstalk·3d ghosting·3D Test Photos·Crosstalk Test·Ghosting Test·Panasonic Viera VT20E·samsung 2233rz·stereo 3d
When talking about stereo 3D gaming one of the most common issue we are all facing is crosstalk or more often referred to as just ghosting or with other words when some part of the image intended for one of the eyes “leaks” into the image the other eye is seeing. The result we see is in the form of semi transparent double of some objects, shadows or halos around objects and that is making the stereo 3D experience less pleasant and comfortable for longer use. And as you should know one of the major reasons for having ghosting is when on the screen we have highly contrasting objects – for example a very bright object on a dark background is quite likely to have ghosting. So in theory not having highly contrasting objects displayed at the same time should greatly help to reduce ghosting and I’ve tried putting that idea into practice a few days ago when I’ve written some tips about the game Portal. In Portal I’ve found some convenient console commands to play with the in-game gamma levels in order to reduce ghosting and the results were good, so I decided to dedicate some time trying to replicate the same effect on a wider level. The results after a days work were good, but not that good as I’ve expected and the reason for that was some kind of unexpected issues I’ve ran into and the lack of a clear solution for them at this point, although I’ve practically tried every idea I was able to stumble into. Anyway, let me get to the point and share some interesting results that actually do help reduce the ghosting in 3D photos, 3D videos and even in some games when played in stereo 3D mode with 3D Vision (should also work with other 3D setups)…
The general idea I’ve had and uses with success in the game Portal was to modify the gamma levels by cutting down the brighter colors over a certain level and thus reducing the level of contrast that can be achieved when displaying dark and bright objects at the same time. Going further with this idea I’ve tried to implement the same approach with the 3D Vision Video Player when playing a stereo 3D video in order to reduce the visible ghosting in it. So I went to the quite easy to use and at the same time quite powerful tool AviSynth and more specifically to the Levels function that is available in it to replicate the same result as within the game Portal, but this time with a stereo 3D video. With the following simple AviSynth script all that was needed was done and the results can be clearly seen if you play the Fly me to the Moon 3D trailer that has some easily noticed ghosting when played normally. Of course the reduction of ghosting works with other videos to some extent, just have in mind that the following simple script does not remove ghosting completely, just helps in lowering it.
Levels(0, 1, 255, 0 , 192, coring=false)
You just need to copy the two lines of code above in a text file and rename the file extension to AVS (AviSynth needs to be installed on your computer). Then you need to open the AVS script file in the 3D Vision Video Player instead of directly opening the video file (the Fly_Me_to_the_Moon_Trailer-720p-S3D.avi in the example code above) and choose the right format (Over/Under for the above example). You’ll notice a slight decrease in the overall brightness of the video, but it should still be completely comfortable to watch and the ghosting you’ll notice should be much less than when opening the video file directly.
But going further I’ve decided to directly modify the graphics adapter gamma LUT (Look Up Table) to reduce the maximum brightness in theoretically every application – being a photo viewer, video player or a game. So again we are going to cut the brighter colors over a certain level to reduce the level of contrast when displaying darker and brighter objects on the screen at the same time and thus reduce ghosting. The process here is similar to creating a custom color profile for your computer when calibrating the color reproduction of the display. And after some experimenting I was able to get the desired result, but then I also faced a problem that turned out to be still unsolvable for owners of Nvidia-powered graphical adapters and we all know that 3D Vision requires you to have such (ATI owner seem to be luckier in this situation). What I’m talking about is the fact that when you run some games in full-screen they reset and totally ignore your custom color profile (your color calibration becomes useless) as well as any custom LUT gamma settings, but luckily not all games do that. There were some tools that supposedly could help you force you settings even over these games, but I was not able to find even a single one that worked on recent Nvidia-based GPUs (if you know about some solution please share it!), only some solutions that seem to be working on the newer ATI GPUs. So have in mind that the solution below will NOT work in all games, but it does work in some games and in the titles it works it can help reduce ghosting, although the final ghosting reduction effect may vary from very good to not so significant in the games it works.
I was able to make things work with a few different applications – free and commercial, but only to some extent as neither of them was able to override the gamma resetting that some games force when switching to full-screen. Finally I’ve settled to use the free Monitor Calibration Wizard by Mike Walters with two custom profiles made by me to achieve the desired effect. You’ll find all the needed files in the archive below, you just need to download and extract them into a convenient folder as there is no need to install anything. Then you just run the MCW.exe file and from the Load Profile dropdown menu choose the reduce-ghosting-192 profile and hit the Load button. This will change the color reproduction making your desktop colors look a bit dull and not so good looking, but don’t worry, this is normal you just need to run a game now and inside it you’ll hardly notice any difference, except for the fact that there should be less visible ghosting (if it is not forcing its own gamma settings, totally ignoring the custom profile). When you finish playing the game and exit back to the desktop you can select the default profile from the dropdown box and hit the Load button to return to the default color setting that should be comfortable again for use in the Desktop.
Here is a short list of games that I was able to test and confirm that work with this method, reducing the ghosting when being played back with the custom LUT gamma and in stereo 3D mode with 3D Vision:
– Assassins Creed II
– Battlefield: Bad Company 2
– Bioshock 2
And a few games that do not work as they force their own color settings when opened in fullscreen mode:
– Dragon Age Origins
– Need for Speed Shift
– Tomb Raider: Underworld
For some of these games, like Portal for example there are alternatives to get the same result, but for other games that force their own color settings it might not be possible, so there is more to be done to improve this solution for reducing the ghosting. The above approach should work well on all currently available 120Hz 3D-capable LCD monitors, but with a more direct product related color profiles it is possible to achieve even better results. The idea is to create custom color profiles where we not just cut the bright colors over a certain level, but to adjust only the “problematic” colors by the level it is needed to reduce the visible ghosting. The end result might be something similar to the “ghost busing” method used by the RealD-equipped movie theaters to reduce the ghosting in 3D movies being projected by compensating for the left and right image colors that may cause ghosting. Unfortunately that is probably out of my level of expertise. ;)
So back to the method I’ve described above, if you decide to give it a try by download the archive below and following the instructions I’ve given out, then please don’t forget to leave your comments below. you can report games that you’ve tried, is it working or not and if it is how good is the ghosting reduction working.
– Download the MCW archive with the ghost reduction profiles here…
Tags:3d game ghosting·3d ghosting·3d photo ghosting·3d video ghosting·3d vision·avisynth·AVS·ghost busting·ghost reduction·ghosting reduction·LUT·LUT gamma·mcw·monitor calibration wizard·Portal·reduce ghosting·s3d ghosting·stereo 3d·stereo 3d ghosting