Colortuner is a simple utility to allow you tuning your color scheme using sliders. It can make any color scheme look great with very little effort.
Use your favorite package manager to install:
git clone https://github.com/zefei/vim-colortuner ~/.vim/bundle/vim-colortuner
Once installed, you can type
:Colortuner to open the tuner panel, then just
use normal movement keys to adjust settings. Tuner settings are persisted to
disk on a per-colorscheme basis.
g:colortuner_preferred_schemes values: list of strings default:  example: ['zenburn', 'solarized', 'cake16'] Colortuner rotates among these colorschemes when you adjust the colorscheme option in tuner panel. If empty list (default) is set, colortuner will rotate among all installed colorschemes. g:colortuner_vivid_mode values: 0 or 1 default: 0 Colortuner by default tries to avoid over-saturation when tuning brightness or contrast. This might result in under-saturated colors. You can set this option to 1 to reverse the effect. g:colortuner_filepath values: string default: '~/.vim-colortuner' This option sets the file path of tuner panel settings. g:colortuner_enabled values: 0 or 1 default: 1 Colortuner is enabled at start if this option is set.
Q: Does colortuner support vim in terminal?
A: Currently no, since true color support is essential for tuning colors. However, Neovim has support for true color terminals, and colortuner supports Neovim in the terminal. But notice that at the moment very few terminals work well with Neovim true color mode.
Q: How can I save tuned colorscheme?
A: You can press 'y' in the colortuner window to yank all color values to current register, then 'p'ut it wherever you want.