Yes, the image are always cached and, due to the reverse gamma correction applied to images stored in memory, gamma is part of the cache key (i.e. a new gamma requires a new entry).Martini wrote: ↑Fri Feb 12, 2021 8:12 am I can repeat this process and see the memory usage climbing in Process Explorer. However, if I re-enter a gamma value that I already used, it is both much faster, and also the memory usage does not increase. Thus I can concluded that these 'images' are cached somehow, and each unique gamma-adjusted image is kept in memory.
Cache removes the unused images only on application demand.
The process of creating/editing an HDR light is slow because it requires to create an importance sampling map for the render (the map matched the HDR image size).