public static Bitmap changeBrightness(Image image, int value)
{
Bitmap newImage = null;
if (image != null)
{
int R, G, B;
newImage = new Bitmap(image);
LockBitmap lbmp = new LockBitmap(newImage);
Color color;
lbmp.LockBits();
for (int i = 0; i < lbmp.Width; ++i)
{
for (int j = 0; j < lbmp.Height; ++j)
{
color = lbmp.GetPixel(i, j);
R = addValueToRGB(color.R, value);
G = addValueToRGB(color.G, value);
B = addValueToRGB(color.B, value);
lbmp.SetPixel(i, j, Color.FromArgb(R, G, B));
}
}
lbmp.UnlockBits();
}
return(newImage);
}
public static Bitmap changeContrast(Image image, double correction)
{
Bitmap newImage = null;
if (image != null)
{
double avgBrightness = 0;
int delta = 0, temp = 0;
double k = 1.0 + correction / 100.0;
int[] palette = new int[256];
newImage = new Bitmap(image);
LockBitmap lbmp = new LockBitmap(newImage);
Color color;
lbmp.LockBits();
for (int i = 0; i < lbmp.Width; ++i)
{
for (int j = 0; j < lbmp.Height; ++j)
{
color = lbmp.GetPixel(i, j);
avgBrightness += color.R * 0.299 + color.G * 0.587 + color.B * 0.114;
}
}
avgBrightness /= image.Height * image.Width;
//Заполнение палитры
for (int i = 0; i < 256; i++)
{
delta = i - (int)avgBrightness;
temp = 0;
palette[i] = addValueToRGB(temp, (int)(avgBrightness + k * delta));;
}
for (int i = 0; i < lbmp.Width; ++i)
{
for (int j = 0; j < lbmp.Height; ++j)
{
color = lbmp.GetPixel(i, j);
lbmp.SetPixel(i, j, Color.FromArgb(palette[color.R], palette[color.G], palette[color.B]));
}
}
lbmp.UnlockBits();
}
return(newImage);
}