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Grayscale

Discussion in 'Home Cinema Buying & Building' started by sdk, Mar 19, 2005.

  1. sdk

    sdk
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    Could anyone post a picture of a greyscale the way it is suppose to be.
     
  2. hornydragon

    hornydragon
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    would only work if your monitor was calibrated (try local library for TV repair books and grey scale patterns)
     
  3. Gary Lightfoot

    Gary Lightfoot
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  4. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    You shouldn't use that pattern for doing greyscale though as its unlikely your display is going to be uniform enough. DLP's and some plasma's should be...but not CRT, LCD, DILA.

    Gordon
     
  5. Gary Lightfoot

    Gary Lightfoot
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    Hi Gordon,

    Why is that?

    Or do you mean you should use the individual grey ire windows/fields when making RGB adjustments for grey scale?

    Gary.
     
  6. sdk

    sdk
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    Ok, thanks guys. And gordon have you figured out where you are going in Norway? The airport isen't named torp is and you are than going to sandefjord or tønsberg?
     
  7. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    Gary:

    If you have a non uniform screen where one side is perhaps blue tinged and other red tinged it means that you could look at that pattern and measure it to be correct but when you actually looked an image the central areas would be incorrect at extremes of light output. You should use white window patterns for doing the adjustment

    Gordon

    No news on Norway yet
     
  8. Gary Lightfoot

    Gary Lightfoot
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    Hi Gordon,

    I see - you can't use that greyscale for LCD is that what you're saying? I've always used it to get an overall impression of my DLPs and then used the individual grey screens (30ire and 80ire) to check colour balance for greyscale when calibrating to D65.

    Gary.
     
  9. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    You can't use it on anything that doesn't have good uniformity. Your DLP is likely to have very good uniformity....

    Gordon
     
  10. sdk

    sdk
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    How woould i gio about to get rid of a green tint in the 100% bright white. increase red, blue or what?
     
  11. Gary Lightfoot

    Gary Lightfoot
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    It depends on the display. If it's a projector with a UHP lamp, you may not have any red left to increase at 100% white, so you will have to reduce the green a little. You may have to adjust the other two colours as well for correct colour balance though. If it's too gren, an FL-ay or CCr30 filtr can help a projector, as it boosts red/cuts green optically

    It's very tricky without a colorimiter or similar to measure the colour balance, and that's where Gordon and his ISF equipment come in handy.

    Sometimes reducing one colour by two dits, and increasing the other two colours by two dits each can work, but it's hit and miss and no guarentee of success.

    Gary.
     
  12. sdk

    sdk
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    It is a crt tv I have been missing a lot when it comes to the colors :) . But thanks i will give it a try.
     
  13. Gary Lightfoot

    Gary Lightfoot
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    I've only ever fiddled with a rear pro set, and it seemed to work in a similar fashion to a pj, but Gordon knows far more than me about CRTs so he's the best man for giving out info in that respect.

    Gary.
     

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