I thought there had to be a standard for histograms. The histogram on the camera (Canon 5D) LCD is nothing like the Digital Photo Professional (DPP) histogram for the same image file. When I expose the Ed Pierce Digital Calibration Target for a neutral exposure for the camera LCD, DPP produces a histogram of everything way to the right of center. In DPP the black (shadow) spike is even to the right of center, white (highlight) spike is shy of clipping and the gray is situated halfway between the shadow and highlight spikes. Furthermore, Adobe ACR shows that the image is underexposed. Seems to me the image file containing the color and exposue values is interpreted with no regards to any standard. With no standard, which one is the true histogram?