ImageHistogram[img] | returns a list of pairs {x, f_{x}}, where x {Min[img], Min[img]+1,...,Max[img]}and f_{x} is the frequency of occurrence of x in *img* |

ImageHistogram[img, {x_{min}, x_{max}}] | returns a list of pairs {x, f_{x}},where x {x_{min}, x_{min} + 1, x_{min} + 2, ..., x_{max}} and f_{x} is the frequency of occurrence of x in *img* |

ImageHistogram[img, {x_{min}, x_{max}, }] | returns a list of pairs {x, f_{x}},x {x_{min}, x_{min} + , x_{min} + 2 , ..., x_{max}} f_{x} are the frequency of occurrence of values in each of the ranges x_{min} + i * *≤ x < x_{min} + ( in *img* |

CumulativeHistogram[hist] | returns a cumulative sum of frequency values in *hist* |

ShowImageHistogram[hist] | plots the image histogram(s) given by *hist* |