Originally Posted by BluCheez
I used a HCFR 100% color window (on the AVCHD disc since you don't have those patterns) and set the Color by adjusting the luminance of a primary as a percent of the luminance of 100% white. The guide said the red luminance should be 21% of the white luminance. Since setting Color effects all primaries equally, setting Color with the Red window should be consistent for blue and green as well. I did similar calculations for blue (8%) and green (71%) to check for consistency and it was at most off by one Color step.
Broadly speaking a colorimeter is a more accurate way to set color in many situations than using a filter. For example, the method outlined in that guide will work reasonably well even if your display uses a CMS to adjust the effective primaries, whereas using a filter will often not work well if the display has a CMS.
However, even without a CMS you could have inaccuracy in setting the color with the EyeOne via:
- Small mismatches between the EyeOne filters and theoretically perfect XYZ filters.
- Red push in the color decoder (which would make red brighter than the other two channels, which would cause you to turn color down to compensate).
- Light reflected off colored surfaces in the room (though typically this is a tiny factor; you'd need to have some large bright-colored object to shift the reading noticeably).
- Roundoff in the calculations in that guide. (Red should be 21.26% of white, green should be 71.52% of white, and blue should be 7.22%)
With the filter, you can have inaccuracy via:
- Red push
- Leakage from the other two channels
So bottom line there are too many intangibles to say. The filter is a direct method that is essentially the same method used by video engineers for years, and on a normal TV with no red push or CMS, and with no visible leakage from the green and red channels, it's extremely accurate. But from everything I've heard the EyeOne is plenty accurate enough to set color correctly.
Are you confident that your TV has no CMS? And can you see the other colors turning absolutely black on the color bars pattern? If so, then the filter seems pretty solid to me.
If, on the other hand, you're not confident about whether your TV has a CMS (or you still see faint ghosts of the other colors through the filter), and you re-check the numbers from the EyeOne with the coefficients mentioned above (and definitely measure all three primaries, not just red), I think using those settings is a perfectly reasonable approach. Unless you want to invest in a pro calibration with a spectroradiometer, I don't think this is a question that can be completely answered via forum posts.