Originally Posted by xenon2000
Plain fact is, if you are used to watching content on an LCD display or most CRTs, then you are used to 8 bit display.
xenon2000 either doesn't quite grasp or doesn't present the issue properly.
Yes, all of the displays are 8-bit video. The issue of 10-bit versus 8-bit is the manner in which the video signals are processed.
8-bit video yields a maximum of only 254 video levels but when the internal processing is 8-bit it can lead to visible image contouring. The reason? 8-bit video can suffer from double rounding during colorspace conversion. Pixel calculations that are rounded up on the way in can be rounded up again on the way out. This double step shows up as a contour, or banding in the image.
10-bit processing provides greater precision and a clean conversion that eliminates double rounding which are the causes of image contours and banding.
If 10-bit processing was a non-issue as xenon2000 suggests, why does Optoma themselves make such a big deal of it?? To quote from the Optoma web-site:Optoma introduces the HD72 home theater projector, a new high performance, digital projector for home theater enthusiasts. The HD72 features [...] 10-bit color per channel processing
With 10-bit color per channel color processing, the Optoma HD3000 delivers great color saturation and subtle color details for the best image quality.
The Optoma EP910 delivers vivid digital images with 10-bit per channel color
With 10-bit color per channel color processing and a 7-segment color wheel, the Optoma HD81 delivers great color saturation and subtle color details for the best image quality.
Contrary to comments by others, I have made no negative comments whatsoever about the exciting new HD70. I simply point out that the 8-bit limitation is real and people should not be surprised when artifacts, as witnessed by Projector Central, become apparent.
I can't believe that the incremental cost of providing 10-bit circuitry (already used in most of their other projectors) versus 8-bit circuitry led to its elimination. I strongly suspect that this is Optoma's intentional way of differentiating the HD70 from their more expensive, higher quality offerings. Otherwise, the HD70 would become their own biggest competition for the rest of their product line and cause a great deal of grief in the distribution channel.
In other words, the limitation of 8-bit processing in the HD70 is a conscious and deliberate choice by Optoma to position the HD70 securely in the "budget" category.
This doesn't diminish the exceptional value that this projector seems to offer but "caveat emptor".