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Marco Cecchetti authored
Added a vtkStdString RGBAToHTMLColor(const vtkColor4ub & rgba) method which given a vtkColor4ub instance as input color returns a valid HTML color string in the `rgba(r, g, b, a)` format. Change-Id: I490d173c2fc2d66869cda4d0db7ae6f632607818
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