Originally Posted by Darrin_R
Tompace - Thanks for sharing.
Can you explain something? I really don't understand why someone would use offset/gain AND primary/secondary. It seems to me that you would change one or the other, but not both. Especially, I wouldn't think you would want to touch CMY since that would effect RGB values. Maybe I am missing something but if you increase Magenta saturation, that will also increase Blue and Red in equal amounts, which were decreased.
The offset/gains are used to adjust the greyscale ranges from low to high. The Primary & Secondary colors display is then adjusted to reflect the appearances of colors at specific levels, based on the greyscale range. You have to calibrate both offset/gain AND primary/secondary.
Please allow me to quote from the 'Greyscale & Colour Calibrations for Dummies Guide", hopefully this will explain better. You can find the guide at this link; http://www.curtpalme.com/forum/viewtopic.php?t=10457
(underlines & bolding mine)
"Calibrating both the greyscale and
colours will greatly improve your display's ability to not only produce black and white accurately but every other colour in between. It will also improve the contrast and allows your display to operate closer to its optimal levels thus prolonging its operating life."
"Greyscale calibration equalizes the colour of grey at various light levels, from very dark (0 IRE) to very bright (100 IRE), to the standard colour temperature of 6500 degrees Kelvin or 6500K. The 6500K colour temperature is "pure" in that it does not contain any colour information. It is purely black or white or a shade of grey in between.
"Colour calibration is the next step
and comes after doing greyscale calibration. Colour calibration ensures that the raw or "primary" colours used to create all colours are correct."Proper colour calibration has the greyscale as its foundation. Accurate colours are not possible unless the greyscale is also accurate.
If we compare this to painting with a brush, greyscale calibration ensures that the proper amounts of paint are mixed together to get the colours we need, while colour calibration is ensuring that we have the right base colours to mix in the first place.
For example: If your bucket of red paint isn't perfectly "pure" red, no matter how you mix in the other primary colours you'll never be able to get that red any more correct.
"...the colours are more vibrant, the contrast better. The image simply has a lot more "pop" to it. With proper greyscale calibration the image has a lot more "punch" to it and will often have a practically 3D look to it. Colours are more natural and shadow details are also more apparent."
I strongly recommend the link, it should answer any further questions, as it is quite extensive & very helpful.