isf calibration

Discussion in 'Displays' started by phyllis, Dec 2, 2003.

  1. phyllis

    phyllis Agent

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    I just had my television calibrated by an isf technician.Its going to take some getting use to the new settings.My questions are that when i use the avia disk to see how it fairs on black levels it seems that the brightness is way to high and i can see both the wavy bars.And the colour seems that there is a lot more colour now.Its seems that colours are over saturated but its not pushing reds.should i turn down the brightness to get only the one wavy line showing? What about colour should i turn that down or just let that grow on me since it was isf'ed
     
  2. Ted Lee

    Ted Lee Lead Actor

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    if it was isf'd, then i would say you should at least give it a few days to see if you just have to get used to it.

    be sure to write down the settings in case you decide to tweak it.

    ultimately, it's your set...watch it the way that seems best to you.
     
  3. JohnnyG

    JohnnyG Screenwriter

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    Is your DVD player set to 'Darker' blacks? Different DVD players have different wording for this and some DVD players don't have this option at all.
     
  4. Heath_E

    Heath_E Stunt Coordinator

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    Phyllis, who calibrated your set? Was it one of the well know, well respected calibrationists that frequent this forum, or was it just someone local to you? Unfortunately, the ISF certification doesn't really tell you much, and their talents can vary widely, very widely. I am sure one of the afore mentioned calibration experts will spot this post soon and will be able to help you determine whether things are right, or if you need to call and do some serious complaining.
     
  5. phyllis

    phyllis Agent

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    He is a toshiba rep and has done over 1000 sets he is very meticulous and took him a couple hours to do my crt 36 inch set.He used a vide pro vp300 and some kind of software on his labtop to get the temp to 6500k or as close as my tv would allow.He tweaked everything from the service menu and then used the blue filter to get the colours right afterwards.
    The detail thaat i am seeing is just amazing.The only thing is that when i went back to chek with avia i found that the brightness was set to high thats what the disk says anyway.I can clearly see both bars clearly have to drop the brightness by eight notches to have it according to Avia.
    Now i dont know if this has any bearing because he went in the service mode or not, plus he was using better equipment so that might make the disk calibrations void?Maybe i will turn down the colour a bit.
     
  6. Gary Mays

    Gary Mays Agent

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    For what its worth, I can't stand watching movies on my set when the brightness is correct per Avia. I always have to turn it up several notches. Otherwise, I lose the ability to distinguish between differnt "shades" of black.

    If I adjust brightness as Avia recommends, a man in a black suit is just a black silhouoette. Turn the brightness up; and wow!, he's got a collar, and pockets, and arms!
     
  7. phyllis

    phyllis Agent

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    I agree with you when i was watching x-men and i went with the avia calibration i started losing different shades of black. With the calibration from the isf technitian i can tell the difference as well.With colours though i think i have to turn it down a bit i find things a little to saturated with this be ok or will i screw up the calibration?
     
  8. Dave H

    Dave H Producer

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    If there has to be a compromise between "rich blacks" or "detail" I rather lose some detail. I find deep, rich blacks give a more three dimensional appearance and more filmlike picture. The compromise is slight, but to me, this looks better. However, sometimes I might boost it up one notch. But, I seem to lose the rich black I like.

    Right now my brightness is set with Avia to the point where I can barely even see the brightest bar --- it's virtually invisible...but I can see 'something' moving. (Keep in mind I have a RPTV and there is light scattering which gives the illusion that the bar isn't there - when it really is.)
     
  9. Scott Wong

    Scott Wong Second Unit

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    I do hope someone certified can chime in about this. Paying cash to have a set calibrated and then have these issues come up seems disheartening to me. Without actually seeing the set for myself, I'm still kinda concerned. There are several ISF-certified technicians locally. Makes me wonder if I'm just better off with my AVIA DVD....

    Scott.
     
  10. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    The problem with using a signal generator is that the TV is optimized for a signal generator and nothing else. Unless you watch the test unit's patterns ... you may never actually see what a proper grayscale looks like. The TV is optimized for a generator ...

    Ideally, the TV should be optimized for your DVD player of choice ... since all DVD players have various idiosyncracies ... so the calibration is supposed to make the TV account for those.

    You essentially got a cake ... but you cannot taste it. In time, the cake rots ...

    When the TV is calibrated to the DVD player ... you get your cake and you get to eat it too. In time, the cake rots, but at least you got to taste it ...

    Regards
     
  11. JohnnyG

    JohnnyG Screenwriter

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    Disagree, but we've been through this before Michael!

    I suggested that phyllis check the black level setting on the DVD player. The answer is there. My advice was ignored so BYE!
     
  12. Gregg Loewen

    Gregg Loewen Video Standards Instructor, THX Ltd.
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    hi guys

    the tech probably used the vp300 to generate the 480p signal, and was incorrectly setup ( this can be a problem with the accupel gear too).

    johnnys answer wil only work if both the player and the generator have blacker than black.

    also, some avia patterns are not correct.

    have you called your isf tech to ask ??

    regards

    gregg
     
  13. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings John,

    Happy happy [​IMG]

    I'm going back to Edmonton on the weekend to touch up a client's Panny 53" since he changed DVD units from an entry level Samsung to a mid scale Pioneer.

    The Pioneer gives him a distinct green tint in the image ... so it is time optimize his TV for the new player. Until I return, he will continue to use the original player ... given the TV set up.

    Just empirical evidence that TV's need to be optimized to the players.

    This is not to say that signal generators serve no purpose ... because they do. They are great for roughing in a grayscale and other settings, but the ultimate fine tuning must be done with the DVD player.

    I'm always warning my clients that want HD calibrated to bear in mind that the calibrated image with the generator might be incompatible with the actual material. More often than naught, the image is too dark after using the signal generator. Black detail is crushed ... on actual material.

    Those that ignore the warning will usually tell me "it's too dark" after the HD calibration. Precisely what I told them it would be. So you get paid to say "I told you so." [​IMG]

    There is also a general calibration rule of thumb for black levels. If you have to err, do it on the side of being bright rather than too dark. There are two black level patterns that one should be looking at ...

    Regards
     
  14. phyllis

    phyllis Agent

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    My setup i have the denon 5803 ouconverting all my signals from all my sources.My dvd player is the denon 5900.What he did was unhook the components from the 5803 going into the dvd player and took the measurments.The dvd player stayed in standard mode so you cant chnage the ire form 7.5 to 0,so it was left at 7.5.i asked him if i should change it to 0 but he said leave everything flat to calibrate.I talked to him regarding turning the colour down and he said it would be o.k it would not mess up the grey scale.Actually i dont find anything dark in the shadows anymore everything is visibe.Prior to when i calibrated with the avia basic patterns for brightness with their wavy lines i could not see as much detail.all my ire wher in the 8500 to 12000k.So now i think with the new settings the avia brightness pattern will not match any more,shoul it?
     
  15. Dave H

    Dave H Producer

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    What are the two black level patterns one should be looking at?

    Also, what patterns are wrong on Avia?

    Do you think I am incorrect to just barely be able to even see the brightest bar on the Avia pattern (with half grey, half black, two bars moving).
     
  16. Michael TLV

    Michael TLV THX Video Instructor/Calibrator

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    Greetings

    On DVE or VE ... use both the pluge pattern with gray boxes and the 50% white pattern with pluge. Then make a determination about where brightness is to be set. The two tests combine to test the power supply of the TV and usually setting it on the first pattern will result in the blacks being crushed in the second pattern.

    Regards
     
  17. Dave H

    Dave H Producer

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    What about for Avia, Mike?
     
  18. Henry Carmona

    Henry Carmona Screenwriter

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    Yeah Mike, or someone [​IMG]

    What about AVIA? Is it the step-child of calibration disks [​IMG]
     
  19. avcalibrations

    avcalibrations Auditioning

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    Hello Phyllis,
    It probably should take you all about five minutes to get used to the calibration picture if done correctly but you will become more and more pleased with the pictue the more you view quality hd channels. If your avia disk seems to give you different mesurements, im curious to know what brand of equipment was used to calibrate your tv and by whom it was done by. There are so many kinds of equipment now people are using to calibrate. Let me tell you about the most expensive equipment out there. That is your eyes! If it looks incorrect on more than one live channel, it most likely is! I have calibrated over 2k televisions using the best equipment out there in my opinion (sencore). I'm not really a big fan of disks only beacause they cost about 50 bucks and my equipment is in the upper thousands. I do however use them as a reference if I believe the picture can be better. I hope this has helped you some. Good Luck!

    Ron Schmidt
    avcalibrations.vpweb.com
     
  20. GeorgeAB

    GeorgeAB Second Unit

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    X,

    Please re-phrase your post. It makes little to no sense to me.

    Best regards and beautiful pictures,
    G. Alan Brown, President
    CinemaQuest, Inc.
    A Lion AV Consultants Affiliate

    "Advancing the art and science of electronic imaging"
     

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