[Digikam-devel] Re: how to properly store a curve in XML

[Marcel Wiesweg]

> Every curve is defined by keypoints by the user. Why not simply store
> these keypoints?

Yes, that would be the way to go. Most tools pass the curves points.
But not all: The problem is the "free curve" mode of CurvesSettings 
(AdjustCurves and BQM tool) and the BWSepiaSettings.

These always store the "curve values", 256/65536, in the CurvesContainer.
In smooth curve mode, couldn't they only pass the 17 points?

Leaves the true "free curve". It seems acceptable to store an 8bit curve, 
which is base64-encoded 344 bytes. It's not pleasant to read this XML then, 
but it should work. We lose 16-bit precision for the curve, but that should be 
acceptable.

Marcel