i1Match laptop setting

[Roy]

Can someone explain the difference between the LCD and the laptop LCD setting in i1Match?

I am creating a profile for a Macbook Air using an i1Pro. The first try using the laptop setting, native white point (turned out to be 6400K) and gamma 2.2 gave a profile that is more pleasing than the Apple-supplied profile (not so blue and better mid-tone detail), but I am curious how a laptop profile differs from a normal LCD profile.

[shewhorn]

Can someone explain the difference between the LCD and the laptop LCD setting in i1Match?

I am creating a profile for a Macbook Air using an i1Pro. The first try using the laptop setting, native white point (turned out to be 6400K) and gamma 2.2 gave a profile that is more pleasing than the Apple-supplied profile (not so blue and better mid-tone detail), but I am curious how a laptop profile differs from a normal LCD profile.

My guess is that there is absolutely no difference at all in the actual profile however... a while back back Integrated Color put a feature into Color Eyes Display Pro that allowed them to control the backlight so that you didn't have to do a monitor pre-calibration. If memory serves me correctly that feature later showed up in other products and I suspect that's what the difference is (it probably just isn't named very well).

Cheers, Joe

[digitaldog]

Can someone explain the difference between the LCD and the laptop LCD setting in i1Match?

The three settings (there may be an old CRT option) just give the software a starting point (some would say a better guess) as to how the display being measured behaves for calibration. Help the software along by providing the correct starting point assumption.

[Roy]

Thanks to shewhorn and digitaldog for the replies, but that doesn't seem to be what is happening. I redid the profile using the LCD setting and obtained a very different profile.

Examining the profiles with Colorsync and using my limited understanding:

 - the Apple profile seems to set the display to gamma 2.4

 - the i1 laptop profile constrains the gamma to 2.2 (the desired gamma) for each of the red, green and blue tone response curves

 - the i1 LCD profile uses different gamma values for the tone response curves, but they  average to 2.23.

Using the i1 Match Monitor Validator tool, both i1 profiles show an average delta E of just over 2, but the LCD profile has larger maximum values.

The i1 laptop profile is more pleasing and gives colour ramps that look a bit smoother, although there is banding in both.

This is more work than a small laptop display deserves (I use a NEC PA271W for serious work), but I was curious and I find that the i1 laptop profile is more useful than the Apple profile.

The three profiles are attached.