PVS-Studio warning V536 for eLynxSDK

inline
void elxLuminocity(const PixelRGBus& iPixel,
                   LuminanceCell< PixelRGBus >& oCell)
{
  oCell._luminance = uint16(0.2220f*iPixel._red +
                            0.7067f*iPixel._blue +
                            0.0713f*iPixel._green);
  oCell._pixel = iPixel;
}

inline
void elxLuminocity(const PixelRGBi& iPixel,
                   LuminanceCell< PixelRGBi >& oCell)
{
  oCell._luminance = 2220*iPixel._red +
                     7067*iPixel._blue +
                     0713*iPixel._green;   <<<---
  oCell._pixel = iPixel;
}

This suspicious code was found in eLynxSDK project by PVS-Studio static code analyzer.
Warning message is:
V536 Be advised that the utilized constant value is represented by an octal form. Oct: 0713, Dec: 459. IFF plugins pixelservices.inl 146

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