private void ChangeThePalette()
{
if (_viewer.Image.BitsPerPixel == 1)
{
return;
}
try
{
int low = (int)(_windowLevelCenter - _windowLevelWidth / 2.0);
int high = (int)(_windowLevelCenter + _windowLevelWidth / 2.0);
int minValue, maxVale;
_currentPalette = new RasterColor[_LUTSize];
MinMaxValuesCommand cmd = new MinMaxValuesCommand();
cmd.Run(_viewer.Image);
minValue = cmd.MinimumValue;
maxVale = cmd.MaximumValue;
RasterPalette.WindowLevelFillLookupTable(
_currentPalette,
new RasterColor(0, 0, 0),
new RasterColor(255, 255, 255),
low,
high,
_viewer.Image.LowBit,
_highBit,
minValue,
maxVale,
0,
_flags);
if (_viewer.Image.BitsPerPixel == 8)
{
_viewer.Image.SetPalette(_currentPalette, 0, _currentPalette.Length);
}
else
{
_viewer.Image.WindowLevel(
_viewer.Image.LowBit,
_highBit,
_currentPalette,
RasterWindowLevelMode.PaintAndProcessing);
}
}
catch (Exception /*ex*/)
{
}
}
public static void WindowLevel(RasterImage image, params string[] parameters)
{
if (parameters.Length >= 3)
{
int width, center;
bool inverted;
if (!int.TryParse(parameters[0], out width))
{
return;
}
if (!int.TryParse(parameters[1], out center))
{
return;
}
if (!bool.TryParse(parameters[2], out inverted))
{
return;
}
int nLowBit = image.LowBit;
int nHighBit = image.HighBit;
if (nHighBit == -1)
{
nHighBit = image.BitsPerPixel - 1;
}
int uLUTLen = 1 << (nHighBit - image.LowBit + 1);
int nFrom = center - (width >> 1);
int nTo = center + ((width + 1) >> 1);
int nFullMinValue;
int nFullMaxValue;
int nLookupTableLength = 0;
if (image.GetLookupTable() != null)
{
nLookupTableLength = image.GetLookupTable().Length;
}
if (image.BitsPerPixel == 8)
{
nFullMinValue = 0;
nFullMaxValue = 255;
}
else
{
if (nLookupTableLength == 0)
{
nFullMinValue = !image.Signed ? 0 : -(0xffff + 1) / 2;
nFullMaxValue = !image.Signed ? 0xffff - 1 : (0xffff + 1) / 2 - 1;
}
else
{
nFullMinValue = !image.Signed ? 0 : -(nLookupTableLength + 1) / 2;
nFullMaxValue = !image.Signed ? nLookupTableLength - 1 : (nLookupTableLength + 1) / 2 - 1;
}
}
RasterColor[] lookUpTable = new RasterColor[uLUTLen];
RasterPaletteWindowLevelFlags flags = ((image.Signed) ? RasterPaletteWindowLevelFlags.Signed : RasterPaletteWindowLevelFlags.None) | RasterPaletteWindowLevelFlags.Outside | RasterPaletteWindowLevelFlags.Linear | RasterPaletteWindowLevelFlags.DicomStyle;
RasterColor startColor = new RasterColor(0, 0, 0);
RasterColor endColor = new RasterColor(255, 255, 255);
RasterPalette.WindowLevelFillLookupTable(lookUpTable, (!inverted) ? startColor : endColor, (!inverted) ? endColor : startColor, nFrom, nTo, nLowBit, nHighBit, nFullMinValue, nFullMaxValue, 1, flags);
if (image.BitsPerPixel == 8)
{
image.SetPalette(lookUpTable, 0, 256);
}
else
{
image.WindowLevel(nLowBit, nHighBit, lookUpTable, RasterWindowLevelMode.PaintAndProcessing);
}
}
}
