HHGramImage and FTGramImage.
This is an internal function and will likely never be called by a userHHTPackagePlotter(img, trace, amp.span, img.x.lab, img.y.lab, blur = NULL,
fit.line = NULL, window = NULL, colormap = NULL, backcol = c(0, 0, 0),
pretty = FALSE, grid = TRUE, colorbar = TRUE, opts = list())FTGramImage