public void ShouldThresholdImageWithTriangleMethod()
{
using (var image = new MagickImage(Files.FujiFilmFinePixS1ProPNG))
{
image.AutoThreshold(AutoThresholdMethod.Triangle);
var colors = image.Histogram();
Assert.Equal(ColorType.Bilevel, image.DetermineColorType());
Assert.Equal(210553, colors[MagickColors.Black]);
Assert.Equal(29447, colors[MagickColors.White]);
}
}
public void ShouldThresholdImageWithKapurMethod()
{
using (IMagickImage image = new MagickImage(Files.FujiFilmFinePixS1ProPNG))
{
image.AutoThreshold(AutoThresholdMethod.Kapur);
Dictionary <MagickColor, int> colors = image.Histogram();
Assert.AreEqual(ColorType.Bilevel, image.DetermineColorType());
Assert.AreEqual(236359, colors[MagickColors.Black]);
Assert.AreEqual(3641, colors[MagickColors.White]);
}
}
public void ShouldThresholdImageWithOTSUMethod()
{
using (var image = new MagickImage(Files.FujiFilmFinePixS1ProPNG))
{
image.AutoThreshold(AutoThresholdMethod.OTSU);
var colors = image.Histogram();
Assert.Equal(ColorType.Bilevel, image.DetermineColorType());
Assert.Equal(67844, colors[MagickColors.Black]);
Assert.Equal(172156, colors[MagickColors.White]);
}
}
internal static MagickImage ProcessImage(Stream image, bool disposeStream = true)
{
var magickImage = new MagickImage(image);
magickImage.Alpha(AlphaOption.Remove);
magickImage.BackgroundColor = MagickColor.FromRgb(255, 255, 255);
if (magickImage.DetermineColorType() == ColorType.Grayscale)
{
magickImage.Grayscale();
}
if (disposeStream)
{
image.Dispose();
}
return(magickImage);
}
