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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImageHSIToRGB.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "vtkImageHSIToRGB.h"
#include "vtkImageData.h"
#include "vtkImageProgressIterator.h"
#include "vtkObjectFactory.h"
#include <math.h>
vtkStandardNewMacro(vtkImageHSIToRGB);
//----------------------------------------------------------------------------
vtkImageHSIToRGB::vtkImageHSIToRGB()
{
this->Maximum = 255.0;
this->SetNumberOfInputPorts(1);
this->SetNumberOfOutputPorts(1);
}
//----------------------------------------------------------------------------
// This templated function executes the filter for any type of data.
template <class T>
void vtkImageHSIToRGBExecute(vtkImageHSIToRGB *self,
vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id, T *)
{
vtkImageIterator<T> inIt(inData, outExt);
vtkImageProgressIterator<T> outIt(outData, outExt, self, id);
double R, G, B, H, S, I;
double max = self->GetMaximum();
double temp;
double third = max / 3.0;
int idxC;
// find the region to loop over
int maxC = inData->GetNumberOfScalarComponents()-1;
// Loop through output pixels
while (!outIt.IsAtEnd())
{
T* inSI = inIt.BeginSpan();
T* outSI = outIt.BeginSpan();
T* outSIEnd = outIt.EndSpan();
while (outSI != outSIEnd)
{
// Pixel operation
H = static_cast<double>(*inSI); ++inSI;
S = static_cast<double>(*inSI); ++inSI;
I = static_cast<double>(*inSI); ++inSI;
// compute rgb assuming S = 1.0;
if (H >= 0.0 && H <= third) // red -> green
{
G = H/third;
R = 1.0 - G;
B = 0.0;
}
else if (H >= third && H <= 2.0*third) // green -> blue
{
B = (H - third)/third;
G = 1.0 - B;
R = 0.0;
}
else // blue -> red
{
R = (H - 2.0 * third)/third;
B = 1.0 - R;
G = 0.0;
}
// add Saturation to the equation.
S = S / max;
//R = S + (1.0 - S)*R;
//G = S + (1.0 - S)*G;
//B = S + (1.0 - S)*B;
// what happened to this?
R = S*R + (1.0 - S);
G = S*G + (1.0 - S);
B = S*B + (1.0 - S);
// Use intensity to get actual RGB
// normalize RGB first then apply intensity
temp = R + G + B;
//I = 3 * I / (temp * max);
// and what happened to this?
I = 3 * I / (temp);
R = R * I;
G = G * I;
B = B * I;
// clip below 255
//if (R > 255.0) R = max;
//if (G > 255.0) G = max;
//if (B > 255.0) B = max;
// mixed constant 255 and max ?????
if (R > max)
{
R = max;
}
if (G > max)
{
G = max;
}
if (B > max)
{
B = max;
}
// assign output.
*outSI = static_cast<T>(R); ++outSI;
*outSI = static_cast<T>(G); ++outSI;
*outSI = static_cast<T>(B); ++outSI;
for (idxC = 3; idxC <= maxC; idxC++)
{
*outSI++ = *inSI++;
}
}
inIt.NextSpan();
outIt.NextSpan();
}
}
//----------------------------------------------------------------------------
void vtkImageHSIToRGB::ThreadedExecute (vtkImageData *inData,
vtkImageData *outData,
int outExt[6], int id)
{
vtkDebugMacro(<< "Execute: inData = " << inData
<< ", outData = " << outData);
// this filter expects that input is the same type as output.
if (inData->GetScalarType() != outData->GetScalarType())
{
vtkErrorMacro(<< "Execute: input ScalarType, " << inData->GetScalarType()
<< ", must match out ScalarType " << outData->GetScalarType());
return;
}
// need three components for input and output
if (inData->GetNumberOfScalarComponents() < 3)
{
vtkErrorMacro("Input has too few components");
return;
}
if (outData->GetNumberOfScalarComponents() < 3)
{
vtkErrorMacro("Output has too few components");
return;
}
switch (inData->GetScalarType())
{
vtkTemplateMacro(
vtkImageHSIToRGBExecute(this, inData,
outData, outExt, id, static_cast<VTK_TT *>(0)));
default:
vtkErrorMacro(<< "Execute: Unknown ScalarType");
return;
}
}
void vtkImageHSIToRGB::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Maximum: " << this->Maximum << "\n";
}
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