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Following the instruction given in this question, I calibrated my monitor meticulously so that it adopts the standard gamma correction across all platforms, e.g. Internet, Photography, etc.

Now what is the standard value of Gamma that I should set? If no standard is given, at least the widely used value that meets the demands of Photography. How about the monitor's setting? should I reset it to "Factory settings"? Or manually reset its RGB value and if yes, what are the ideal values?

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Gamma and RGB values in your monitor's setting are subjective - they only apply to your monitor.

The only way to calibrate a monitor correctly is using a device such as a Huey Pro. This way the COMPUTER knows exactly what the MONITOR is putting out and can correct accordingly.

I set gamma to 2.2, then calibrate.

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This is not correct, you usually have an encoding gamma correction done at the image capture and a decoding correction done by the display itself. For instance BT.709 OECF (± 0.5 gamma) which encodes HD camera linear light values to non linear R'G'B' components and your display that for example use sRGB (2.2 gamma) or BT.1886 EOCF (2.4 gamma) and decodes those non linear R'G'B' components. – Kel Solaar Mar 23 at 8:04

Within the Windows universe, the standard gamma value is 2.2. With Mac OS X 10.6 and later it is also 2.2. Prior to that Macintosh computers used either 0.55 or 1.8. It should be noted that JPEG images carry gamma-encoded values (the intensities are not linear).

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There are different standards.

sRGB which is the typical colour space of computer monitors refer to gamma 2.2, and is most commonly used in JPEGs as PC screens are assumed to be where it ends up.

BT.709 used in HD TVs are gamma 2.4.

I tend to find those gammas to be too pale so I like to use 1.8. But in a PC monitor/ Photography context, standard is 2.2.

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BT.709 doesn't actually define a display gamma (EOCF / EOTF) but an encoding gamma for HD cameras (OECF / OETF). The EOCF standardised for HD TV is BT.1886. – Kel Solaar Mar 23 at 7:58

because there is no defined standard for gamma across all platforms, i tend to take an average and set it to 2.0. this works pretty well moving colour between pc and mac.

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