nothing wrong with the mathematical mapping of 'light' and 'dark' 'contone' onto the image in xara - and its a useful feature
but the user is not in control of it [the profile slider that Marc mentioned is useful as a 'balancing/cross-fade' control, but little else]
a couple of PS examples attached where the user has actually been defining the mapping of the colour[s]
EDIT: that is defining the mapping by defining the gradient - which you can't do in xara - there is a difference between something being mapped by default... and actually mapping something...
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