# pybedtools.bedtool.BedTool.colormap_normalize

`BedTool.``colormap_normalize`(vmin=None, vmax=None, percentile=False, log=False)

  Returns a normalization instance for use by featurefuncs.add_color().

  Parameters:

  vmin, vmax : float, int, or None

  > `vmin` and `vmax` set the colormap bounds; if None then these will be determined from the scores in the BED file.

  log : bool

  > If True, put the scores on a log scale; of course be careful if you have negative scores

  percentile : bool

  > If True, interpret vmin and vmax as a percentile in the range [0,100] rather than absolute values.