public void Apply(WriteableBitmap image)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
for (int i = 0; i < image.Pixels.Length; i++)
{
Color pixel = FilterHelper.GetColor(image.Pixels[i]);
double greyValue = pixel.R * 0.299 + pixel.G * 0.587 + pixel.B * 0.114;
double r = greyValue + 2 * Value;
if (r > 255)
{
r = 255;
}
double g = greyValue + Value;
if (g > 255)
{
g = 255;
}
double b = greyValue;
pixel.R = (byte)(r);
pixel.G = (byte)(g);
pixel.B = (byte)(b);
image.Pixels[i] = FilterHelper.GetInt32(pixel);
}
}
public void Apply(WriteableBitmap image)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
// Helligkeitsanpassung erfolgt durch addieren des gewünschten Betrages
for (int i = 0; i < image.Pixels.Length; i++)
{
Color pixel = FilterHelper.GetColor(image.Pixels[i]);
double r = pixel.R + Value;
if (r > 255)
{
r = 255;
}
if (r < 0)
{
r = 0;
}
double g = pixel.G + Value;
if (g > 255)
{
g = 255;
}
if (g < 0)
{
g = 0;
}
double b = pixel.B + Value;
if (b > 255)
{
b = 255;
}
if (b < 0)
{
b = 0;
}
pixel.R = (byte)(r);
pixel.G = (byte)(g);
pixel.B = (byte)(b);
image.Pixels[i] = FilterHelper.GetInt32(pixel);
}
}
public void Apply(WriteableBitmap image)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
// Jeder Pixel erhält den selben Wert in allen Farbkanälen
// die ungleichmäßige Berücksichtigung der Kanäle bewirkt eine natürliche Farbwiedergabe
for (int i = 0; i < image.Pixels.Length; i++)
{
Color pixel = FilterHelper.GetColor(image.Pixels[i]);
pixel.R = (byte)(pixel.R * 0.299 + pixel.G * 0.587 + pixel.B * 0.114);
pixel.G = pixel.R;
pixel.B = pixel.R;
image.Pixels[i] = FilterHelper.GetInt32(pixel);
}
}
public void Apply(WriteableBitmap image)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
// Kontrast = ((100 + X) / 100)²
double contrast = (100.0 + Value) / 100.0;
contrast *= contrast;
// Kontrastanpassung erfolgt auf dem Bereich [-1,1] und wird durch Multiplikation mit dem Faktor erreicht
for (int i = 0; i < image.Pixels.Length; i++)
{
Color pixel = FilterHelper.GetColor(image.Pixels[i]);
double r = pixel.R / 255.0;
r -= 0.5;
r *= contrast;
r += 0.5;
r *= 255;
if (r > 255)
{
r = 255;
}
if (r < 0)
{
r = 0;
}
double g = pixel.G / 255.0;
g -= 0.5;
g *= contrast;
g += 0.5;
g *= 255;
if (g > 255)
{
g = 255;
}
if (g < 0)
{
g = 0;
}
double b = pixel.B / 255.0;
b -= 0.5;
b *= contrast;
b += 0.5;
b *= 255;
if (b > 255)
{
b = 255;
}
if (b < 0)
{
b = 0;
}
pixel.R = (byte)(r);
pixel.G = (byte)(g);
pixel.B = (byte)(b);
image.Pixels[i] = FilterHelper.GetInt32(pixel);
}
}
