Adjust color balance/brightness/contrast on scanned mesh I am currently learning how to use blender as a tool to clean up and edit 3D scans. I am currently working on really large scans which were split in multiple chunks. Some of the chunks differs slightly in vertex color balance and brightness from each other. 
To be able to make a complete mesh from the chunks I would like to know if there is a way to adjust parameters such as color tone and brightness and contrast on the separate chunks? 

I know that in the "Paint Vertex" menu toolbars there are tools like this (brightness/contrast), but I haven't been able to figure out if and how they can be applied to a complete chunk. 
I don't even know if the Vertex paint are the right tool for this since it only colors the areas visible in the viewport when I need to make changes that will apply to the whole chunk at once?

Thanks for any helps and have a great day!
The file used in this question is of Stanford PLY format, vertex colors, no textures.

When the mesh is selected, changes in brightness etc. that applies to the whole mesh is found under:

"Vertex Paint" - "Paint" - "brightness/contrast"-"Hue Saturation level", "Levels" "and "Invert"

The screenshot below demonstrates the solution using the "brightness/contrast" parameters