I suggest implementing Decorrelation stretching for the display of color composites, an old but yet very useful method. Very popular among Envi users.
Perhaps it would be best implemented in the QGIS rastr display properties.
References
http://dhanushkadangampola.blogspot.com/2015/02/decorrelation-stretching.html
Gillespie, A. R., Kahle, A. B., and Walker, R. E. (1986), Color enhancement of highly correlated images. I. Decorrelation and HSI contrast stretches, Remote Sensing of Environment, 20:209-235
http://www.sciencedirect.com/science/article/pii/0034425786900441
[1]D. A. ROTHERY, “Cover Decorrelation stretching as an aid to image interpretation,” International Journal of Remote Sensing, vol. 8, no. 9, pp. 1253–1254, Sep. 1987, doi: 10.1080/01431168708954771.
https://doi.org/10.1080/01431168708954771
[1]D. A. ROTHERY and G. A. HUNT, “Technical note A simple way to perform decorrelation stretching and related techniques on menu-driven image processing systems,” International Journal of Remote Sensing, vol. 11, no. 1, pp. 133–137, Jan. 1990, doi: 10.1080/01431169008955005.
Done
TrueColor (left) and decorrelated TrueColor strech (right)