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# Posts by hwjohn

The Y stuff isn't important as far as I'm concerned (maybe it is to alluringreality, but I doubt it). We were basically using what we were given to match HCFR. However, I don't think we want to go changing things on the disc until we can verify that they are incorrect. I'm not knocking your measurements, but we have to find if there is a problem first, and then where the problem is in order to fix it. I'm just trying to check our RGB values using the theoretical math.
In a sense, yes. We are just dealing with the theoretical math, so everything is perfect. You are right about 8 bit RGB, but it would be true for any discrete system. The error just becomes smaller as you increase the bit depth. Pretty much every pattern we produce has some rounding.
We are taking the display out of it altogether. We know the theoretical chromacity for 50% red sat... the question is whether or not the RGB triplet we are using to author the pattern is correct (195,95,95) to represent that chromacity.
Guys, I posted this in the Hi End PJ forum but didn't get a response. I'm just looking to see if these number seem reasonable, and for any further information if someone has it. Any info would be greatly appreciated. Original Post: Hi guys, I know that most of us are interested in Home Theater, but I have project I'm working on that includes a larger venue. I'm pretty inexperienced with projectors, but I know enough to be dangerous. Some specs: Screen to first...
I think we are talking past each other too. The matrices you provided are just in a little different format than what I'm used to seeing/using, but no problem. Let's see if this helps. Let's break it down onto 3 equations from the 3x3 matrix, going in reverse: 1) From the second matrix (XYZ->RGB) we should have the following 3 equations: R = (3.24156*X) - (1.53767*Y) - (0.49870*Z) G = -(0.96920*X) + (1.87589*Y) + (0.04155*Z) B = (0.05562*X) - (0.20396*Y) +...
Thanks for the help Tom. If you don't mind, let me get clarification on a couple things. 1) The first matrix, am I to dot (compute the dot product) of that matrix with my xyY coordinate, and that will give me XYZ coordinates, correct? I got confused with it because it had RGB out to the left. Just to make sure I have it correct, the first equation would be: X = (X0*x) + (Y0*y) +(Z0*Y) Seems like I have that wrong just looking at it. Please let me know. The second...
Evidently 6 years of college engineering has left me mathematically inept. Does anyone have equations to convert to RGB from xyY? I tried deriving them using the xyY->XYZ and XYZ->RGB equations from Bruce Lindbloom and Poynton's sites, but there is either some step I'm missing or I'm just plain stupid. If you have them, please note if they are normalized or for a specific range. I need these in reference to AVSHD. There have been some reports that the saturation...
They look right to me, assuming that just computing the distance along the line between the white point and selected secondary/primary is the correct thing to do. That is how I would do it. I do remember something coming up when we were first looking at saturation patterns. We did something wrong and had to get some help from the ColorHCFR guys. From what I remember it had to do with converting x,y coordinates in to an RGB triplet, not with calculating the x,y...
lol, its kind of an inside joke. If you want a good laugh read this:http://lonelymachines.org/mall-ninjas/ My other hobby is firearms, and the quote in my sig is from a guy known as "The Mall Ninja." Evidently he is/was a mall security guard whose mall was overtaken every night by the Italian Mob, drug dealers, the CIA, and even small country militaries. The quote is correct, which tells you exactly how stupid (and funny) he is. Thanks for pointing it out tho By the...
You could ask laric here:http://www.avsforum.com/avs-vb/showt...983943&page=21 What specifically do you want to know? Just the x,y locations, or why they are where they are?
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