crt calibration

I'm not a pro, but it sounds like you will probably have to adjust the gains and cuts of red. If you can't do it via the user menu, you will have to do it via the service menu.

I can imagine the service menu of a CRT being very dangerous if you don't know how to navigate, though.

You could also just adjust the color control until red measures correctly. I would rather have red fixed and a deficiency of blue than to have overpowering reds..

What make/model display do you have? What controls do you have?
If you only have the global Color/tint then use your meter and adjust your color control to reduce the average luminance error until you have the least difference between all 3 colors. Use the tint to reduce the Delta H errors to the lowest value across all secondary colors.
Then view content and make the final teaks. If you have Calman or Chromapure do a saturation sweep to see how the set tracks.
Edited by airscapes - 2/9/13 at 3:02pm

They're supposed to have precision decoders, but I had a Sony PVM-1390 years ago that had strong red push. It was an NTSC 13" CRT production monitor. Looking through the colored filters from Avia, I could see that if I lined up blue, red was way too strong. Visually, skin tones had the chronic sunburnt look. I checked it with pattern generators and DVD players. I did end up dialing color in a compromise position between what was good for red and what was good for blue, but leaning more toward what was good for red.

That is actually not correct - we have a lot of broadcast customers who use LightSpace CMS for monitor calibration... especially if being used for grading.

It is true that monitors used for general monitoring within the broadcast transmission operation are rarely accurately calibrated, but that's because thay are not used for critical colour monitoring, just basic signal checking.

Steve

Sorry, no, that is not correct at all.
I am actually a colourist, with a lot of credits to my name, and Light Illusion provides calibration to many of the grading facilities around the world - both post-production and broadcast.
No professional colourist would ever rely on 'blue only' for calibration of a grading display.

Cheers,

Steve

No probs - and thanks for the comment.
I really do appreciate that.

The 'blue' only mode works with displays that have fixed gamut and RGB Separation, that is intrinsically accurate.
It wont work on displays that are inaccurate as all you are doing is matching the 100% blue to the component of blue within white.
That is not accurately correcting gamut, just matching it effectively to itself.

Does that make sense?

Steve

Depending on where in the broadcast chain the monitors were being used prior to you getting them, it's possible they were calibrated to a much warmer color temperature... possibly 3200K or 5500K or 5700K. If that's the case the "21% red" standard derived from d65 calibration does not apply to those calibrations. Presumably the controls of the monitors will support calibration to d65.

The blue-filter method is really imprecise because the filters vary so much, as does the spectral distribution of the phosphors used in various displays. You could make it accurate if you had full control over the filter and phosphors, but that's rarely the case and filters do change over time and have to be replaced to avoid an inaccurate result.