I tried to recalibrate my primaries with Getgray yesterday. The result were different than the AVIA disk the day before (too green). I now believe that the colors space may be not well convert by my scaler. I will try today directly from my sony PS3 and my Toshiba HD A1 to see if there is a difference. I thing that Greg was saying that the conversion matrix in the Sharp are almost perfect. If I see no difference, maybe my calibration probe need calibration. Red turn orange when I make it fit the the point on the 709 reference. Any trick to make sure I do the correct thing? My scaler is an Anthem D2. How can I know for sure that the colors space is correct. A expert calibrator would know right away because he have seen many. It's not my case. I never calibrated primaries before.

One more question. If I feed 480p directly to the sharp the colors space from avia and Getgray will be 601? If It goes via the scaler and output 1080p it's now 709 right?
Bruno

Just calibrate to these targets.

http://home.comcast.net/~tlhuffman/color_targets.gif

Though the differences between SD and HD color spaces are real and perceptible, as you can see, it's not exactly night-and-day. It is not, for example, nearly as big a difference as found between the default Sharp 20K colors and the colors after calibration.

I don't see why you would get different results from the 2 discs. Either should be fine. If, after calibration, the result "looks" wrong, then I would question the meter. You might want to try the Eye One Display 2. It's inexpensive, accurate, and is supported by the Progressive Labs software you use.

I'm not sure about the primaries on AVIA since I use other discs but I know the grayscale windows and field patterns has slight color errors due to the MPEG encoding process of the day. We use other discs for grayscale and primary/ secondary colors but this is probably the reason for the differences.

Bob

I knew that tis was a problem with the gray scale patterns, but I hadn't heard that it extended to the color fields. Avia Pro, which I've been using, certainly doesn't suffer from this problem.

I'm not sure if it affected the color fields either but according to Guy Kuo the gray scale patterns were off because of the MPEG encoding process, so maybe it affected the color fields as well. Again, I'm not sure but it would certainly explain the differences. AVIA Pro is much nicer.

For consumers DVE and Sound & Vision HT tune up (AKA Avia Jr. with but no MPEG errors) will give you a good combo of patterns for about the price of AVIA. Definitely, get AVIA Pro if you don't mind spending the extra money.

Bob

I'm not sure if it affected the color fields either but according to Guy Kuo the gray scale patterns were off because of the MPEG encoding process, so maybe it affected the color fields as well. Again, I'm not sure but it would certainly explain the differences. AVIA Pro is much nicer.

For consumers DVE and Sound & Vision HT tune up (AKA Avia Jr. with but no MPEG errors) will give you a good combo of patterns for about the price of AVIA. Definitely, get AVIA Pro if you don't mind spending the extra money.

Bob

I have DVE. Do I use de 75IRE or 100IRE color windows? DVE is difficult to navigate. I don't plan to buy Avia pro now. I'm waiting for an HD DVD or Blu-Ray version. Two bad I sold my lumagen scaler. All the test patterns were accessible directly from the scaler.

Bruno

I was able to achieve great primaries and secondaries calibration this week. It does make a difference. I have a question for peoples that are familiar with the Sharp. When we use CMS we have access to "hue" and "saturation" for each colors. There is also "value" what does that do?

And anyone can explain what added value does Brillant colors provide?

I was able to achieve great primaries and secondaries calibration this week. It does make a difference. I have a question for peoples that are familiar with the Sharp. When we use CMS we have access to "hue" and "saturation" for each colors. There is also "value" what does that do?

And anyone can explain what added value does Brillant colors provide?The "Value" is the intensity or luminance of the color--literally the amount of light you can measure from a color. You can use the parameter to fix color decoding errors, though the 20K's decoder is quite good to begin with. Here's an image that illustrates the relatiionship between the 3 parameters.

http://home.comcast.net/~tlhuffman/colortree3600.jpg

I'd leave the Brilliant Color turned off.

For those mucking with CMS - I linked a spreadsheet in the calibration sticky that contains the equations and text links for converting CIE xyY to CIE LCH.

Kraz:

Nice spreadsheet. However, I get several divide by zero errors on the white rows.

That would be because there is no defined hue/chroma to white if it is perfectly calibrated, works fine if it is uncalibrated! I probably should have posted something without a perfect white - I was just using someone elses numbers and they did not give me the white measure.