Huawei P9 / all digital cameras (blue sky trick)

Since digital cameras and white balance settings, there is a trick to turn a dull grey sky into something blue, while keeping you talent (in a close portrait situation) with a very natural appearance.

The images I shot, testing the technique with the P9, I cannot share on the interwebs, sorry for that.
Anyway, here is the technique:

1. put the camera into the pro mode
2. select the incandescent (light bulb) white balance (that should turn everything daylight into blue)
3. force flash (this will fire the flash, which is daylight equivalent)

Should you be confused now, this is what it is all about:

• the camera "thinks" that white surfaces are illuminated by warm light
• the camera flash fires at daylight color temperature (usually used for fill-flash)
• parts of a scene outside the range of the flash will be taken as incandescent
• parts of a scene within the range of the flash will be illuminated by a daylight spectrum 

Therefore, you will get 2 different color profiles within a single image. 

As indicated before, I tried the method, and it works with the P9, however, I am unable to share the results online.

I wish to point out that this is, next to using polarised filters, a method that cannot be replicated in post-processing.