private void ShiftBrightness(float brightness)
{
if (selectedFileName.Length > 0)
{
for (int i = 0; i < actualBitmap.Width; i++)
{
for (int j = 0; j < actualBitmap.Height; j++)
{
var pix = actualBitmap.GetPixel(i, j);
var bright = pix.GetBrightness();
if (bright + brightness < 1 && bright + brightness > 0)
{
var respix = ColorRGB.FromHSLA(pix.GetHue(), pix.GetSaturation(), bright + brightness, pix.A);
actualBitmap.SetPixel(i, j, respix);
}
}
}
}
}
// Given H,S,L,A in range of 0-1
// Returns a Color (RGB struct) in range of 0-255
public static ColorRGB FromHSLA(double H, double S, double L, double A)
{
double v;
double r, g, b;
if (A > 1.0)
{
A = 1.0;
}
r = L; // default to gray
g = L;
b = L;
v = (L <= 0.5) ? (L * (1.0 + S)) : (L + S - L * S);
if (v > 0)
{
double m;
double sv;
int sextant;
double fract, vsf, mid1, mid2;
m = L + L - v;
sv = (v - m) / v;
H *= 6.0;
sextant = (int)H;
fract = H - sextant;
vsf = v * sv * fract;
mid1 = m + vsf;
mid2 = v - vsf;
switch (sextant)
{
case 0:
r = v;
g = mid1;
b = m;
break;
case 1:
r = mid2;
g = v;
b = m;
break;
case 2:
r = m;
g = v;
b = mid1;
break;
case 3:
r = m;
g = mid2;
b = v;
break;
case 4:
r = mid1;
g = m;
b = v;
break;
case 5:
r = v;
g = m;
b = mid2;
break;
}
}
ColorRGB rgb = new ColorRGB
{
R = Convert.ToByte(r * 255.0f),
G = Convert.ToByte(g * 255.0f),
B = Convert.ToByte(b * 255.0f),
A = Convert.ToByte(A * 255.0f)
};
return(rgb);
}