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This implements the filer of the same name in the Filter Effects specification: http://dev.w3.org/fxtf/filters/ The document says that filter functions must operate in the sRGB color space. However, it also describes the color-interpolation-filters property, which is set to linear by default, for the filtering primitives used to implement the functions. Since sepia is a thin wrapper around the feColorMatrix primitive, we ignore what the specification says about the filter function, and expose the color-interpolation-filters property on the filter operation. https://bugzilla.gnome.org/show_bug.cgi?id=750542
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