This addon will create a RGB Histogram for color images and a Luminosity Histogram for grayscale photos. Options include whether you want a combined/overlayed histogram (red, green, and blue channels overlayed on each other) or a stacked histogram (red, green, and blue channels separated), width (default is 256 pixels wide by 100 pixels high) and the background color for the histogram. The latest version of this addon allows you to make histograms for a range of images and is accessed by the RGB-Histogram menu. Special thanks to wjarosz who helped map the values out more accurately and blend the colors on the combined histogram.