Hi,

I'm new to this forum.

I have read with great interest the calibration of domestic video displays. The calibration techniques and calibration being very similar to when I worked in the broadcast industry over 25 years ago!

It would appear that domestic displays could be calibrated to a higher standard than was possible with broadcast technology 25 years ago.

I have a Sony 32inch and Delphi 42 inch plasma. I have an Eye one Pantone calibrator and light meter. I have 2 reference discs, DVE and Burosch.

When reading many users experiences, after calibration, there appears to be concern regarding 'Red Push'. This probably exists more in the Japanese produced displays, due to the colour temperature being 'cooler' when the colour decoder is set-up.

My question is how really bad is 'red push'? After adjusting my Sony, I ended up adjusting the saturation from -25 to 0. At first this appeared to produce excessive 'red push', but this was not on all viewing material, most of it looked more natural. Therefore would it be right to assume that many instances of 'red push' is caused by the studio director wanting richer, more unnatural colours?

Another question. People on this forum have mentioned that the 'eye one' is not accurate for setting up the colour temperature on a plasma, as the 'eye one' does not have a sufficient filter to filter out the infra red spectrum of a plasma device, Is this so? And if it is, what action do you take to correct the inaccuracies?

Final question. Has anyone calibrated Sony KE32 plasma? I have the service manual, but it doesn't go into any detail with regards setting up the chroma decoder. Also, it does not mention how to get out of the service mode. I assume that switching off the device will resume normal operation?

Many thanks in advance for any help.

Therefore would it be right to assume that many instances of 'red push' is caused by the studio director wanting richer, more unnatural colours?

No, red-push, at least the red push referenced here on the forum and by calibrators is an inaccurate color decoder which impromperly accentuates red saturation, essentially, to keep the images from looking to bluish given the hideously inaccurately high greyscale on most TVs in their default settings.

This, actually, has gotten a lot better, I'd wager to say that most TVs these days have accurate color decoders.

Certainly content can be mastered in ways that accentuate reds or other colors for various reasons, but red-push is a color decoder error/inaccuracy. It actually makes a fully accurate image impossible to attain unless you can alter the color decoder itself so it operates correctly.

The calibration techniques and calibration being very similar to when I worked in the broadcast industry over 25 years ago!

It would appear that domestic displays could be calibrated to a higher standard than was possible with broadcast technology 25 years ago.

Well, if the standards remain the same, what we're calibrating to remains the same. The major change has been HD standards, and 709 primaries are slightly different than SMPTE C, however the significance of this is of questionable relevance given that much content is still mastered using SMPTE C monitors, AFAIK.

No, red-push, at least the red push referenced here on the forum and by calibrators is an inaccurate color decoder which impromperly accentuates red saturation, essentially, to keep the images from looking to bluish given the hideously inaccurately high greyscale on most TVs in their default settings.

Can you explain red push in terms of x, y, Y? When you say 'accentuates' red saturation, do you mean that red is over saturated (outside the specified color gamut)? Or does it mean the Y value with respect to the other colors?

Thanks.

Can you explain red push in terms of x, y, Y? When you say 'accentuates' red saturation, do you mean that red is over saturated (outside the specified color gamut)? Or does it mean the Y value with respect to the other colors?

Thanks.

I'm pretty sure he means "Y", the luminance component.:)

Thanks, Royce.

Thanks Chris,

I've just read the link at the bottom of your mail. Interesting to note that If I connect my set-up via the Analogue RGB input I will effectively by-pass the internal decoder. I've known this to be true with CRT analogue monitors of the past, but did not think that the Digital flat screens would do this, as you can still adjust the 'Saturation' in this mode, which indicates too me that it is still going through the colour decoder. I must double check, as this is the case with the Video RGB input, but I'm wondering whether the PC RGB input is the same?

Has anyone got any answers for my other questions?

I know that this is an American forum, but unfortunately we do not have a similar forum in the UK. So, maybe, this forum is not too familiar with the Delphi/Sony plasmas I have mentioned?

Thanks