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It is now possible to manipulate palette functions and ggplot2 scales using
the colour manipulation functions in this package (#5, #7). When passed one
of these objects, a modified wrapper object is returned. This allows colour
tweaks to be made to standard scales in ggplot2 plots. See the README for a
visual example.
The gradient() function now returns a function if its second argument is
missing or NULL. This change is complementary to the one above, allowing
palette functions to be created.
Conversions from HSV to RGB coordinates are now more precise.