a good place to start is the g2 ( screen grid) set up 
turn bright and contrast to min 
adjust screen grid  ( lower shaft on ihvt )  to the point a hint of video appears on screen
then adjust contrast / brightness to desired levels
for chroma balance   " greyscale or white balance "...  as Peale stated  .
note the bottom starcase should run from white to blk,  and it should not be tinted  r, g or b 
qrz