I have not come across anything that automates this process, but it should be very easy to do manually. Take the existing color scheme, paste it into your catalog ~/.vim/colors/and place the colors that are defined in the pigment scheme in the appropriate places.
For example, if you use my color scheme (which uses a custom format to make it more editable) and force it to use the pigment autumn scheme , you can take a line that looks like this:
let ColourAssignment['Function'] = {"GUIFG": '#007777', "CTERMFG": 'Cyan'}
and change it like this:
let ColourAssignment['Function'] = {"GUIFG": '#00aa00'}
(I removed the assignment of color terminals, since you said you were using a graphical interface, and that pretty much doesn't matter).
. ( , ), : "" , s:MakeDarker if &background == 'light'.
, (,) darkblue.vim ():
hi ErrorMsg guifg=
:
hi ErrorMsg guifg=