/// <summary>画像の明るさを得る</summary>
/// <param name="bmp">画像</param>
/// <returns>光度ラベル</returns>
public LabelStructure GetBrightness(Bitmap bmp)
{
LabelStructure label = new LabelStructure(bmp.Width, bmp.Height);
BitmapData data = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
byte[] buf = new byte[bmp.Width * bmp.Height * 4];
Marshal.Copy(data.Scan0, buf, 0, buf.Length);
bmp.UnlockBits(data);
for (int i = 0; i < buf.Length; i += 4)
{
HSV hsv = HSV.FromRGB(buf[i + 0], buf[i + 1], buf[i + 2]);
int x = i / 4 % bmp.Width;
int y = i / 4 / bmp.Width;
label[y, x] = (int)(hsv.V * 255);
}
return(label);
}
/// <summary>Colorクラスを作成する</summary>
/// <param name="c">色</param>
/// <returns>RGBの色<see cref="Color"/></returns>
public static Color ToRGB(HSV c)
{
double v = c.V;
double s = c.S;
double r, g, b;
if (s == 0)
{
r = g = b = v;
}
else
{
double h = c.H / 60;
int i = (int)Math.Floor(h);
double f = h - i;
double p = v * (1 - s);
double q;
if (i % 2 == 0)
{
q = v * (1 - (1 - f) * s);
}
else
{
q = v * (1 - f * s);
}
switch (i)
{
case 0:
r = v;
g = q;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = q;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = q;
g = p;
b = v;
break;
case 5:
r = v;
g = p;
b = q;
break;
default:
throw new ArgumentException("色相の値が不正です", "HSV");
}
}
return(Color.FromArgb((int)Math.Round(r * 255f), (int)Math.Round(g * 255f), (int)Math.Round(b * 255f)));
}
