Calibration for different Blu Ray Player



Quote:
Originally Posted by Michael TLV /forum/post/18105273


Greetings


Yes ... they do. Even the same Samsung model ...


If the guy is local ... make him agree to come back say in 6 months for a retweak should you change players.


regards

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Forgive me since I don't spend any time in the field, but would that only be via analog component cable?


I would think via HDMI all models would output the same digital signal. I would also assume that many players would output the same signal for the same calibration patterns.


I'm all theory, and a programmer, so I just see bits as bits.


I could see different player have slightly different post-processing algorithms that change the output, but within a model in digital output I can't fathom why the pattern would be different.

Greetings


In theory ... copying numbers from TV to TV also gives the same results. And yet one TV off the assembly line and the next one don't give the same image with the same numbers.


And then we expect the $150 BD player to perform better than the $4000 TV.


We live in an analog world ... not a digital one like the world of TRON ...


Regards



Quote:
Originally Posted by Michael TLV /forum/post/18105844


Greetings


In theory ... copying numbers from TV to TV also gives the same results. And yet one TV off the assembly line and the next one don't give the same image with the same numbers.


And then we expect the $150 BD player to perform better than the $4000 TV.


We live in an analog world ... not a digital one like the world of TRON ...


Regards

Click to expand...

While I understand the issue from TV to TV, because the physical characteristics of the display and the light generated by that source is somewhat different from set to set, I find it nearly infeasible that a different BD player of the same model would generate different data on the HDMI port.


Those of us in 10011100 land do depend on the TRON like principles that integrated circutes can reproduce EXACTLY the same output given input within the specified tolerances. Without the reliability of integrated circuits, intel, IBM, Microsoft, apple, wouldn't exist. If only 80% of the time we got back 10 from 01 + 01 then all IC's would be worthless.


Isn't your saying that 2+2=4 and that's what calibration is about.

Well as far as manipulating digital data goes, 0010+0010=0100;

Anything different is a defect.

Although I am an amateur (so I will defer it the pros shoot me down!) ... I have calibrated my display and have checked grayscale across multiple HDMI sources, and they are all extremely consistent.


I have two Blu-ray feeds (Panasonic BD35 and PS3) and an HD DVD player (HD-A2) and I can calibrate the grayscale on any of the three devices, and then re-measure using one of the other devices, and my grayscale measures the same. I have the downloadable AVS patterns disc for both HD DVD and Blu-ray, and also DVE HD DVD, and I can check on any of them and it is still consistent.


I get similar consistency across HDMI sources on my friends' setups whom I have helped calibrate.


I just don't see how much variation there can be among digital HDMI output from devices like this. Obviously when dealing with a nonstandard source (like a cable box) different channels may be all over the map.... but one BDP to another?

Quote:
Many Blu Ray players have a Cinema or Movie mode, which changes the gamma. Assuming your TV is accurate, you should avoid these.

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Spot on -- I think the key here is that some players will have internal picture controls that can alter the output... in which case, of course that will screw up your calibration! But if you know how to configure your player to avoid these types of player-side alterations, I would imagine you should get pretty darn consistent results.