private IMagickImage ToNearBlackWhite(IMagickImage image)
{
IMagickImage result = image.Clone();
if (GrayLimit == 0 && ColorFuzz == (Percentage)0)
{
return(result);
}
result.ColorFuzz = ColorFuzz;
result.Opaque(MagickColors.White, new MagickColor("gray(" + (100 - GrayLimit) + "%)"));
result.Opaque(MagickColors.Black, new MagickColor("gray(" + GrayLimit + "%)"));
result.ColorFuzz = (Percentage)0;
return(result);
}
private void RemoveNoise(IMagickImage image)
{
using (var second = image.Clone())
{
second.ColorSpace = ColorSpace.Gray;
second.Negate();
second.AdaptiveThreshold(FilterSize, FilterSize, FilterOffset);
second.ContrastStretch((Percentage)0);
if (SmoothingThreshold != null)
{
second.Blur(SmoothingThreshold.Value.ToDouble() / 100, Quantum.Max);
second.Level(SmoothingThreshold.Value, new Percentage(100));
}
image.Composite(second, CompositeOperator.CopyAlpha);
}
image.Opaque(MagickColors.Transparent, BackgroundColor);
image.Alpha(AlphaOption.Off);
}
private void CopyOpacity(IMagickImage image)
{
image.Alpha(AlphaOption.Off);
using (var gray = image.Clone())
{
gray.ColorSpace = ColorSpace.Gray;
gray.Negate();
gray.AdaptiveThreshold(FilterSize, FilterSize, FilterOffset);
gray.ContrastStretch((Percentage)0);
if (Threshold.HasValue)
{
gray.Blur((double)Threshold.Value / 100.0, Quantum.Max);
gray.Level(Threshold.Value, new Percentage(100));
}
image.Composite(gray, CompositeOperator.CopyAlpha);
image.Opaque(MagickColors.Transparent, BackgroundColor);
image.Alpha(AlphaOption.Off);
}
}
