internal static extern bool SetChannel(uint dib, uint dib8, ColourChannel channel);
 internal static extern bool GetHistogram(uint dib, [In, Out] int[] histo, ColourChannel channel);
 internal static extern bool GetChannel(uint dib, ColourChannel channel);
 internal static extern bool AdjustCurve(uint dib, byte[] lut, ColourChannel channel);
 internal static extern bool SetChannel(uint dib, uint dib8, ColourChannel channel);
 internal static extern bool GetHistogram(uint dib, [In, Out] int[] histo, ColourChannel channel);
 internal static extern bool GetChannel(uint dib, ColourChannel channel);
 internal static extern bool AdjustCurve(uint dib, byte[] lut, ColourChannel channel);