Sorry for the forgetting and the delay. In manual, Histogram plugin, in the first paragraph under the figure 10.46, change to: The Histogram is always performed in floating point RGB regardless of the project color space, but with clipping at 1.0. When using the X11 graphics driver and RGBA-FLOAT color model, Histogram allows you to display greater than (0 - 1.0f) values to accomodate HDR. This does not work when using X11-OpenGL because it is an 8-bit limited driver. The display will stop at +110\%, but there is no clipping. By lowering the brightness all out-of-range values become visible, even those initially above 110\%. The histogram has two sets of transfer parameters: the \textit{input transfer} and the \textit{output transfer}... Note1: the start of the second paragraph I put in to show the space between the two paragraphs, but it remained unchanged in content. Note2: In Color3way and Videoscope, can you change (0 - 1.0) in (0 - 1.0f)?