public static Bitmap GetStretch(Bitmap image_original, int margin, ColorSystems cs)
{
// Get data
var stretch = new Bitmap(image_original);
var histoData = ColorSystem.GetHistoDataMethod(cs)(image_original);
var minsAndMaxs = GetHistoMinMax(histoData, margin);
var stretchPix = ColorSystem.GetStretchPixelMethod(cs);
// Stretch
for (int i = 0; i < image_original.Width; i++)
{
for (int j = 0; j < image_original.Height; j++)
{
stretch.SetPixel(i, j, stretchPix(image_original.GetPixel(i, j), minsAndMaxs));
}
}
// Return it
return(stretch);
}
public static Bitmap GetHistogram(Bitmap image, int margin, bool showMargin, bool showMinMax, ColorSystems cs)
{
// Get data
var histoData = ColorSystem.GetHistoDataMethod(cs)(image);
var minsAndMaxs = GetHistoMinMax(histoData, margin);
var histo = new Bitmap(256, 100);
int histoDataMax = 0;
foreach (var kvp in histoData)
{
int max = kvp.Value.Max();
if (histoDataMax < max)
{
histoDataMax = max;
}
}
// Draw histogram
using (Graphics g = Graphics.FromImage(histo))
{
// Clear it
g.Clear(Color.White);
// Draw the parts
foreach (var kvp in histoData)
{
// Data Conversion
var vals = new PointF[256];
for (int i = 0; i < 256; i++)
{
vals[i] = new PointF(i, ((kvp.Value[i] * 100) / histoDataMax));
}
// Make sure there is a start/end point
var list = vals.ToList();
list.Insert(0, new PointF(0, 0));
list.Add(new PointF(255, 0));
vals = list.ToArray();
g.FillPolygon(new SolidBrush(Color.FromArgb(TRANSPARENCY, Color.FromName(kvp.Key))), vals);
}
// Draw MinMax
if (showMinMax)
{
foreach (var kvp in minsAndMaxs)
{
var dashpen = new Pen(Color.FromName(kvp.Key), 1f)
{
DashPattern = new float[] { 4, 2 }
};
g.DrawLine(dashpen, new Point(kvp.Value[0], 0), new Point(kvp.Value[0], 255));
dashpen.DashPattern = new float[] { 1, 1 };
g.DrawLine(dashpen, new Point(kvp.Value[1], 0), new Point(kvp.Value[1], 255));
}
}
// Draw Margin
if (showMargin)
{
var dashpen = new Pen(Color.Black, 1f)
{
DashPattern = new float[] { 4, 2, 2, 2 }
};
g.DrawLine(dashpen, new Point(0, ((margin * 100) / histoDataMax)), new Point(255, ((margin * 100) / histoDataMax)));
}
}
return(histo);
}
