Hi All,

Just bought an i1 Display LT to calibrate my Samsung LA32B650 LCD TV using HCFR. I've managed to get fantastic results for the greyscale but the primaries and secondaries are confusing me.

On my TV the colourspace is adjusted by varying the amount or red, green and blue for each of the primaries and secondaries. ie. I have RGB sliders for red, RGB sliders for blue, RGB sliders for green, and the same for all the secondaries.

When I adjust these I cant seem to get the x,y values for the primaries right. If x is correct then y is off and vice versa. Am I doing something wrong or is it just not possible to set the primaries correctly with this TV?

I can post the graphs from HCFR if it will be helpful. Any advice would be greatly appreciated.

Greetings

If the Triangle starts out smaller than 709 in certain areas ... you can never expand the triangle to make it bigger. Only take away to make it smaller. One cannot magically add all new colors to a TV that can't display them.

regards

thanks for the reply. I think I understand now. I have completed a full calibration now and I'm pretty happy with the results. I will post my HCFR graphs and see what everyone thinks.

Besides the issue Michael pointed out... my experience calibrating displays which were already owner-calibrated with the i1-LT is that the i1-L isn't very accurate at measuring color - this is a problem with most lower-cost meters. The meter will produce color readings just fine... but when the display is re-measured with a meter that is good at measuring color, the inaccuracies become easy to find. The LT is fine for grayscale, but my experience is that you can't trust it for CMS measurements.

So the next question is whether the LT is "better than nothing" in regards to color measurements - I can't answer that. I'd have to reset the display to defaults to see where the original points were and then measure the settings the LT thinks are best and compare to the factory setting measurements. I've never had an opportunity to try that so I can't say how "off" the LT adjustments would be compared to factory defaults.

By the way... the 3 sliders adjust all 3 coordinates for color... if you are looking at Red, for example, the Green and Blue sliders move the red point more towards either green or blue - that is the only control you have over x or y. The Red slider for red controls the luminance of red... the Y. So xy coordinates are only part of getting colors right. When you are working on a complimentary color, say Cyan for example, the Green and Blue sliders move the color closer or farther from green or blue while the Red slider will move the measured point across the triangle towards red. So for complimentary colors, you only have control over the xy coordinates (no Y control).

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By the way... the 3 sliders adjust all 3 coordinates for color... if you are looking at Red, for example, the Green and Blue sliders move the red point more towards either green or blue - that is the only control you have over x or y. The Red slider for red controls the luminance of red... the Y. So xy coordinates are only part of getting colors right. When you are working on a complimentary color, say Cyan for example, the Green and Blue sliders move the color closer or farther from green or blue while the Red slider will move the measured point across the triangle towards red. So for complimentary colors, you only have control over the xy coordinates (no Y control).

Actually, Doug, for the complementary colors, by moving all the sliders up or down together, one does have Y control over the secondaries. Of course, moving them in lock step frequently perturbs the x-y position a little, and one has to readjust for that.