Brightness

This algorithm adjusts the brightness of specified image in RGB color space. This algorithm works by increasing every pixel's RGB values by the specified adjust value.

   



									public static void ApplyBrightness(ref Bitmap bmp, byte brightnessValue)
{
	BitmapData bmpData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

	unsafe
	{
		byte* ptr = (byte*)bmpData.Scan0.ToPointer();
		int stopAddress = (int)ptr + bmpData.Stride * bmpData.Height;

		int val = 0;

		while ((int)ptr != stopAddress)
		{
			val = ptr[2] + brightnessValue;
			if (val < 0) val = 0;
			else if (val > 255) val = 255;
			ptr[2] = (byte)val;

			val = ptr[1] + brightnessValue;
			if (val < 0) val = 0;
			else if (val > 255) val = 255;
			ptr[1] = (byte)val;

			val = ptr[0] + brightnessValue;
			if (val < 0) val = 0;
			else if (val > 255) val = 255;
			ptr[0] = (byte)val;

			ptr += 3;
		}
	}

	bmp.UnlockBits(bmpData);
}
								


Example

									Bitmap b = (Bitmap)Image.FromFile("rose.jpg");
ApplyBrightness(ref b, 50);