With 'copy from main window to window#N' operation, the image is copied as it is rendered in the main window, including the Shadow Boost effect.
It isn't possible to re-render images in the secondary windows, so shadow boost on/off switch will not affect secondary windows (and it is almost impossible to implement without huge internals change).
We'll consider applying the current state of shadow boost (and highlights inspection) for an image dragged into a secondary window for some next intermediate update.
When 'copy from main window
With 'copy from main window to window#N' operation, the image is copied as it is rendered in the main window, including the Shadow Boost effect.
It isn't possible to re-render images in the secondary windows, so shadow boost on/off switch will not affect secondary windows (and it is almost impossible to implement without huge internals change).
We'll consider applying the current state of shadow boost (and highlights inspection) for an image dragged into a secondary window for some next intermediate update.
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Alex Tutubalin/FastRawViewer team