I wonder, though, if the Mirage F1 is really as suitable for adversary role? Sure French Mirages were modernized somewhat, but avionics set is still very old even compared to KAHU Skyhawks.
Well the Mirage F1 is a mach 2 fighter an that can be interesting for agressors. It can also receive modern avionics upgrades like the MF2000 MLU
As confirmed by Air Fan magazine, it will be directionnal.
There are a lot of new interesting features in this F4 standard.
There is also the development of the AASL, a 100 Kg/100 Km multi sensors A2G weapon which could be included in the F4. The MBDA smartglider is apparently a good candidate for that job:
And also the THALES BAT-120 LG a 35 kG class LGB that can be carried in bundle of 3 on light hardpoints
It is also worth noting that 73 new Rafale F4 will be delivered to the French forces from 2021
the problem is, the sky color during the era of model 2001 and 2002 were usually grey. This is China we’re talking about and when those reveals and flights took place, there were always smog or cloudy weather
The light in a Cloudy weather is even more blue because the red and yellow light from the sun is filtered by the cloud layer.
The perceaved color of a object is the product of 3 functions:
1- the spectrum of the illuminant (which can be a mix of primary and secondary sources)
2- the spectral reflectance of the object (the “color” you are looking for)
3- the sprectral response of the observer (camera sensor or human eye)
Then the brain or the Image signal processor must perform a white point to neutralize the whites (this requires the aptitude to recognize white or grey objects is the scene).
This can be very complicated because you can have grey objects illuminated by different light sources in the same scene.
Anyways, what you are asking for, is the spectral reflectance of the J-20’s paint (a perfect neutral grey would be a flat curve with the same reflectance for all wavelengths of the visible spectrum).
This is impossible to know from a picture because you don’t know the 2 other functions nor how the camera did its white point.
If you want to know the “real color” (ie the spectral reflectance) of an object you need a calibrated source and a calibrated spectrometer like this guy :
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