Hi Peter,

some ideas from a typical photo workflow:


perspective correction    - select some prominent lines from the image
                            and "get them straight"

alignment of horizon line - in cooperation with an automated guess?

crop & rotate, set        - virtual photography ala google earth?
aspect ratio                perhaps even with composition aids (rule of
                            thirds, Westhoff's Diagonal Method, etc)

levels, curves - could support the user's intention more directly:
                   - mark places in the image, which should be brighter/darker,
                     or have more/less contrast or modified colors
                   - the whitepoint, graypoint pickers could be adjustable 
markers
                     on the image. Or a completely different method for 
whitebalance?
                   - if tones are getting compressed, better control of where 
the
                     clipping happens (separately for each of R,G,B, Value)

gradation map  - nearly the same: map image points to positions in the gradient


greetings,
peter

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