I've been using Luminance HDR for a while and I managed to understand the effect of most of the tonemapping algorithms, but there's still a thing that I don't fully understand.
When I finish the importing procedure (selecting the pictures, aligning them and selecting the HDR parameters) this screen comes up.

[![The screen that comes up before selecting the tonemapping operator](https://i.stack.imgur.com/OCwW0.jpg)](https://i.stack.imgur.com/OCwW0.jpg)

From what I understand, it show the merged pictures without any tonemapping operator applied, just adding up the pixels. This hypothesis is supported by the fact that changing the "mapping" option or moving the blue slider doesn't affect the tonemapping result. I think this is just meant as a preview of what the actual HDR picture, or the tonemapped LDR one, will look like. 

Is it correct or am I wrong?