Originally Posted by Murilo
Projector central has an odd review up for it.
I don't know the reviewer, but he is the same guy who in his Vivitek review wrote:
Where this projector really shines, though, is ANSI contrast. ANSI contrast describes the relative black and white levels that can appear in the same image at the same time - in other words, ANSI contrast measures the maximum contrast in any one particular image.
For projectors especially that is most definitely not true. ANSI CR does not describe the black and white levels that can appear in the same image at the same time, it describes the white and black levels for a very extreme example of an image. One that is about 5 times as bright as the average movie image and even a higher multiple than that from many real images that contain both black and white. A projector like a CRT can have 130:1 ANSI CR and be able to do multiple thousands to one maximum CR across images that contain both black and white. If a CRT with 130:1 ANSI CR could never do more than 130:1 in any one image it would look pretty poor compared to what they can actually do. And the JVCs would look much poorer if they could never do more than about 300:1 in any one image, but fortunately that is not the case. The more white in the image the lower the CR in general, but also the more our eyes bias to see gray as black.
The maximum CR that a particular projector can do in any one image would be more like the native or static on/off CR, not the ANSI CR. ANSI CR matters, but it measures something different than the reviewer claimed. Anybody who stuck that Vivitek up against a new JVC with the dynamic system turned off on the Vivitek (leaving ANSI CR the same) and then tried scenes with a little bit of white and a lot of black (like some in Star Wars
) would likely see pretty clearly that the Vivitek didn't have more range between white and black there. And those are the kinds of scenes where the maximum range between white and black (or maximum intra-image CR) is achieved, not scenes with extreme amounts of white, like the ANSI CR checkerboards.
I'll be a little bit skeptical about his claims about contrast ratio until he figures that one out (I sent them an email about the subject matter, but didn't get a response).
In the comparison between the W6000 and the HC6800 he said:
The W6000 is higher in contrast. There is a greater range between black and white in any given image. However, the HC6800 is capable of deeper black levels in darker scenes.
That part about greater range may or may not be true depending on the native on/off CRs and ANSI CRs of both. The W6000 has a greater range between black and white in the 4x4 checkerboard for ANSI CR, but for real images the W6000 may have greater range in some and the HC6800 in others (with things like individual street lights or car headlights in otherwise very dark scenes tending to favor the higher native on/off CR projector, but depending on the individual mixes). If their native on/off CRs are very close then the higher ANSI CR of the W6000 may come through in most mixed scenes though. Since the reviewer showed some lack of comprehension of the subject matter in his Vivitek review I'm not sure what to conclude about his claim about the W6000 vs HC6800 there.