I am processing NGB images for obtaining Blue NDVI. The problem is that the scale of colors does not match reality. For instance, dirty roads that should be orange or red are displayed green, please check image 1.jpg
When adjusting the bars to the beginning and the end of the histogram curves, it gets worst, plese check image 2.jpg
It gets closer to reality when the bars and the histogram are non related, please check 3.jpg
Any ideas of what am I doing wrong?