I did some tests to see which of the major CC plugins use floats and which use integers. It turns out that only Blue Banana and Gamma support values above the range (0-1.0). Histogram Bezier reads values above 1.0 but does not use them, returning the usual clip. I start by showing the original image (png) where we can see details in the brightly lit window. In Compositor we don't see those details, getting only pure whites. So CinGG does not support HDR, as we already know (project setting to RGBA-FLOAT). However, even if we don't see them the details are there. To see them we have to do Tone Mapping, for example by decreasing the brightness levels until the values above 1.0 are back inside the range. With the Histogram plugin you can easily do this by lowering the white point along the vertical. No plugins show the details hidden in the white point except Blue Banana and Gamma. Since HDR is handled only in floating point (there are no values outside the range 0-255 or 0-1023, etc.), then I believe that all plugins work on integers except the two mentioned above. The test video can be found here: https://streamable.com/rh62t9