xskip1,i,h,INDEF,0,,X pixels to skip at start of overscan
xskip2,i,h,INDEF,0,,X pixels to skip at end of overscan
xtrim1,i,h,INDEF,0,,X pixels to trim at start of data
xtrim2,i,h,INDEF,0,,X pixels to trim at end   of data
ytrim1,i,h,INDEF,0,,Y pixels to trim at start of data
ytrim2,i,h,INDEF,0,,Y pixels to trim at end   of data