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.

   

• C#
• VB.Net

									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);