An image histogram is a graphical representation of the distribution of pixel intensity values in an image. It provides a useful tool for understanding the brightness and contrast of an image. If you are searching for synonyms for image histogram, you may come across some terms such as intensity distribution, pixel distribution, brightness histogram, or grey level histogram. Other alternatives like tonal distribution, luminance histogram, and contrast histogram may also be used to describe the same visual representation. However, regardless of the term you use, image histograms are essential tools for photographers and designers to manipulate the tone and contrast in their images.