[Knut Jansohn]

Hi Juan,

[Juan Salvo] “I’ve tested a GTX 590 standard PC version on a Mac Pro 4,1… works fine… Performances is about on par with my EFIed 480,”

wow – great news!

But how do you feed the 480 with enough power? External power supply?

Wich OSX do you run? I guess it’s only possible with Lion?

Thanks & regards

Knut

[Knut Jansohn]

Try rgb-mixer at the noisy parts.
For example mixing r (and b) to g should prevent noise in the purple parts because you preserve the information from the red channel.

Regards

Knut

[Knut Jansohn]

You might aske them for their techical guidlines / standads.
Or figure out the guidlines from the broadcaststation. Some stations declare broadcast-safe ‘overcautiously’

It’s possible to get non legal cvbs-levels with legal RGB-levels. Therefor tektronix had developed the arowhead-display. Maybe there is an issue? I don’t know if that is still important in your country. In Germany the anlog broadcasting ends this year (30.04.) 🙂

At least you could use a hardware-legalizer to rescue this job.

[Knut Jansohn]

Hi Bernard,

1000 shots per day means 30s per shot.
So the question is, what your client expects you can do in 30s. And what you are able to do in 30s.
That depends on your skills and the ability of the tools you are using.
In this situation I would show what is posible with more time / powerful tools.

If they want to by luxury villa for the price of a shanty – you had better go now.

Regards

Knut

[Knut Jansohn]

Did you try soft clip?

[Knut Jansohn]

As I understand it, IRE is useless in the digital world.

If a digital scope shows IRE or voltage of a digital signal it shows how an ideal da-converter would create the analog signal.
Mathematicaly 1023 should result nearly 109% not 120, so it’s a bug?

An real analog device can’t build an ideal signal. It will produce overshoots on high contrast and will show a fuzzy signal-line there.
Thats one reason why a real waveformmonitor has a lowpass-filter (not only to disable the chroma in a composite-signal)

[Knut Jansohn]

Broadcast safe 625 video 100 IRE = 700 mV (Pal)
Broadcast safe 525 video 100 IRE = 714 mV, max allowed: 120 IRE (NTSC)

That’s why I don’t like this IRE-scale.
And it’s used for analog signals not digital values. So it depends on the DA-converter if full scaled or legal scaled signal will match the desired values.

But in case of your screenshot: values around 120% in all RGB-channels can’t result in Y-Value around 100%! I guess there is a bug in your scope.

Regards
Knut

[Knut Jansohn]

[Gabriele Turchi] “converted to XYZ (with a lut i guess )”

Yes.

Graded on a Broadcastmonitor, after finishing the client asked me to build a version for DCI.
To check the results of the conversion-lut I would like to preview it on an other monitor in p3.
Due to the different whitepoint and an lower brightness I suppose that there is perhaps more required than a mathematical conversion.

[Gabriele Turchi] “thought that DCP compliant projector could accept XYZ directly”
But then it first convert internally to its own real primaries

[Knut Jansohn]

[Jose Lomeña] “Why not easydcp player?”

Thanks a lot. I will have a look at it.

[Knut Jansohn]

[Gabriele Turchi] “i don’t see why you want to check the XYZ on a “non XYZ” display …”

For XYZ are virtual primaries, there is no XYZ-display existing.
So if you want to view XYZ-coded colors you have to convert to real primaries.
Depending on the ‘wideness’ of the real colorspace you will see a part of the XYZ-coded colors.
After grading in 709 I have converted a short to XYZ for DCI.
But as there is a gamma 2.6 and other whitepoint and lower lightness. I would like to get an idea how it will look in dci.
This should be possible with a monitor that meets dci-specification.

Regards