|| || || || || || || ||

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RgbLogMag.h

Go to the documentation of this file.

#ifndef Impala_Core_Array_Trait_RgbLogMag_h
#define Impala_Core_Array_Trait_RgbLogMag_h

#include "Util/Math.h"
#include "Core/Array/Element/E1Cast.h"

namespace Impala
{
namespace Core
{
namespace Array
{
namespace Trait
{


template<class ValT>
class RgbLogMag
{
public:
    RgbLogMag(Real64 lowVal, Real64 highVal, Real64 logScale = 255.0)
    {
        mLowVal = lowVal;
        mHighVal = highVal;
        //Real64 sc1 = 255.0;
        Real64 sc1 = logScale;
        //Real64 sc1 = 16.0;
        mFactor = (sc1-1.0)/(mHighVal-mLowVal);
        mLowVal = (mLowVal*mFactor)-1.0;
        mSc2 = 255.0 / ::log(sc1);
    }

    void
    DoIt(const ValT& pixV, UInt8* rgbPtr)
    {
        Int32 x = (Int32)
            (::log(Element::E1Cast(pixV, Real64()) * mFactor - mLowVal) * mSc2);
        *rgbPtr++ = x;
        *rgbPtr++ = x;
        *rgbPtr++ = x;
    }

private:
    Real64              mLowVal;
    Real64              mHighVal;
    Real64              mFactor;
    Real64              mSc2;
};

} // namespace Trait
} // namespace Array
} // namespace Core
} // namespace Impala

#endif

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