void Run()
{
MagickWandEnvironment.Genesis();
var qr = (double)MagickWandEnvironment.QuantumRange;
WriteLine(new string[] { "Quantum Range", $"{qr}" });
Console.WriteLine();
WriteLine(new string[] { "Image Name", "Mean", "StdDev", "Mean (pct)", "StdDev (pct)", "Kurtosis", "Skew" });
foreach (var file in Directory.GetFiles(_opts.PhotoRoot))
{
double mean, stddev, kurtosis, skewness;
using (var wand = new MagickWand(file))
{
wand.AutoLevelImage();
wand.GetImageChannelMean(ChannelType.AllChannels, out mean, out stddev);
wand.GetImageChannelKurtosis(ChannelType.AllChannels, out kurtosis, out skewness);
WriteLine(new string[] { $"{Path.GetFileName(file)}", $"{mean}", $"{stddev}", $"{mean / qr}", $"{stddev / qr}", $"{kurtosis}", $"{skewness}" });
}
}
MagickWandEnvironment.Terminus();
}
void PrintStats(string file, MagickWand wand)
{
double mean, stddev, kurtosis, skewness;
wand.GetImageChannelMean(ChannelType.AllChannels, out mean, out stddev);
wand.GetImageChannelKurtosis(ChannelType.AllChannels, out kurtosis, out skewness);
Console.WriteLine($"{Path.GetFileName(file)}\t{mean}\t{stddev}\t{kurtosis}\t{skewness}");
}
public void ComposedTest()
{
var contrastRatioThreshold = 0.5;
var tooContrastyThreshold = 1.9;
MagickWandEnvironment.Genesis();
PrintStatsHeader();
foreach(var file in _files)
{
using(var wand = new MagickWand(file))
{
double mean, stddev;
wand.GetImageChannelMean(ChannelType.AllChannels, out mean, out stddev);
PrintStats(file, wand);
wand.AutoLevelImage();
var contrastRatio = stddev / mean;
var contrastyRatio = stddev / 10000;
if(contrastRatio < contrastRatioThreshold)
{
var saturationAmount = Convert.ToInt32((contrastRatioThreshold - contrastRatio) * 100) * 4;
// limit the saturation adjustment to 20%
if(saturationAmount > 20)
{
saturationAmount = 20;
}
saturationAmount += 100;
Console.WriteLine("modulating by: " + saturationAmount);
// 100 = don't adjust brightness
// 300 = don't rotate hue
wand.ModulateImage(100, saturationAmount, 300);
}
else if(contrastyRatio > tooContrastyThreshold)
{
Console.WriteLine("attempting to reduce contrast");
wand.SigmoidalContrastImage(true, 2, 0); // smooth brightness/contrast
}
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008); // sharpen
WriteImage("composed", file, new string[] { }, wand);
}
}
MagickWandEnvironment.Terminus();
}