It is a special kind of bar graph where bars represent bins that group together values at specific intervals. The luminance is computed for each pixel with the formula 0.2126*R+0.7152*G+0.0722*B (ITU BT.709) A histogram is a visual representation of the distribution of numerical data. Histogram is based on the frequency of luminance in the image. An histogram is a graphical representation of the repartition of colours among the pixels of a numeric image. It is useful when you don’t have defined bins for a histogram. In Excel 20, we can directly create a histogram chart by using predefined histogram template in excel. The query against user_tab_histograms is the query I used to calculate the cardinality of a join where there were frequency histograms on the columns at both. The calls to dbms_stats create histograms on the skewed data sets, and I've reported a few significant numbers about the 4 relevant columns. Home Create histograms in excel Create a Histogram in Excel - Easy Excel Tutoria