No subject

1) load raw file and create full histogram of that image data
2) move histogram values according to sliders on the fly (without doing a new
raw development)
3) if the slider stops start a new fullsized raw processing in background and
if finished update preview and histogram from that data

For example dxo (one of the best raw developer out there, but proprietary) work
like that.

As digikam do not dive deep into raw decoding, but compute histogram data on
top of an existing image, this is at least not trival to archive.

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