butterworth
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- May 17, 2011
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I bought the best mid-range DLP projector in the market recently, Acer X1161P. I read about the rainbow effect and suspected it might cause trouble. And yes, even with the X1161P you can see the rainbows, whenever there is fast moving white objects. You very rarely notice them, but they still cause eye strain and even slight nausea.
From reading the different forums, it seems that the main problem problem is the color separation caused by too fast updates from dark to light. People are recommending dimming the projector. The economy-mode seems to help somewhat. Less white movement means less rainbows and the projector even makes less noise.
I came up with another fix that seems to correct to issue more or less. Since the rainbows are caused by too fast dark to light pixel updates, I use software to filter the video. I'm using Ffdshow with temporal smoothing of 4. This smears the frames so that the rainbows are replaced by shadows effects from the temporal smoothing. The result is almost no eyestrain and no nausea, although the screen looks like its a plasma screen due to the slowed down pixel updates. It still looks awesome, but no discomfort from viewing.
Has anyone else tried this? I'd like to hear if other people find this useful. I know this topic will be obsolete in a couple of years with LED bulbs, but this might be useful to anyone buying a DLP now. It seems that the main problem with the old DLPs is that they tried to push it to a frame update frequency that the technology cant do without the rainbow artifacts.
From reading the different forums, it seems that the main problem problem is the color separation caused by too fast updates from dark to light. People are recommending dimming the projector. The economy-mode seems to help somewhat. Less white movement means less rainbows and the projector even makes less noise.
I came up with another fix that seems to correct to issue more or less. Since the rainbows are caused by too fast dark to light pixel updates, I use software to filter the video. I'm using Ffdshow with temporal smoothing of 4. This smears the frames so that the rainbows are replaced by shadows effects from the temporal smoothing. The result is almost no eyestrain and no nausea, although the screen looks like its a plasma screen due to the slowed down pixel updates. It still looks awesome, but no discomfort from viewing.
Has anyone else tried this? I'd like to hear if other people find this useful. I know this topic will be obsolete in a couple of years with LED bulbs, but this might be useful to anyone buying a DLP now. It seems that the main problem with the old DLPs is that they tried to push it to a frame update frequency that the technology cant do without the rainbow artifacts.