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On how to get accurate result from mColorBook, mColorMeter (iOS)

(Below use mColorX to represent mColorBook and mColorMeter.)

The Munsell and RGB interconversion algorithm used in mColorX is very well developed, it has very good round trip for the in-gamut colors providing that the monitor is well calibrated (or profiled since you can’t calibrate an iOS device).

1). Get mColorX know the color behavior of your device.
mColorX use icc profile to do it’s color management. Although some ready-made icc profiles which are quite aligned with iOS devices’ color gamut are shipped with the app, it is recommended that you profile/characteristic your own device and use the generated icc profile in mColorX. It may sound crazy to profile an iOS device, but if you are all about accuracy and happened to have a color measuring instrument (See supported instruments at http://argyllcms.com/doc/ArgyllDoc.html) you can make use of the open source Argyll Color Management System, here’s the how to:
http://www.modelmayhem.com/po.php?thread_id=604212&page=1#post13236454

2). Keep your device at same state as you color profile it.
For iOS devices, this means setting the screen brightness since this is the only thing adjustable. Go to “Settings->Brightness & Wallpaper”, turn off “Auto-Brightness” and set screen brightness to about 50% (or the exact number you set when you profile your device).

3). Be careful of the out-of-gamut warning.
You may wonder why there’re so little in-gamut colors in some hues when browsing through mColorBook. The main reason lies in the iOS device’s limited color gamut, and profiling the color space to a standard state may further compress the color gamut. The color space of the interpolated munsell renotation data is comparative to that of CIE XYZ, thus much larger than the RGB color space of the iOS device. So be aware that munsell colors that are out of gamut of the device RGB color space may not be displayed correctly.

FYI, below are some links on color gamut of iOS devices:

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