The easiest way to convert an image to gray scale is to set the RGB values of every pixel to the average of each pixels RBG values.
R = (R + B + G) / 3
G = (R + B + G) / 3
B = (R + B + G) / 3
Here's a code snippet for manipulating a BitmapSource object using the WriteableBitmap class into a gray scale image:
public unsafe static BitmapSource ToGrayScale(BitmapSource source)
{
const int PIXEL_SIZE = 4;
int width = source.PixelWidth;
int height = source.PixelHeight;
var bitmap = new WriteableBitmap(source);
bitmap.Lock();
var backBuffer = (byte*)bitmap.BackBuffer.ToPointer();
for (int y = 0; y < height; y++)
{
var row = backBuffer + (y * bitmap.BackBufferStride);
for (int x = 0; x < width; x++)
{
var grayScale = (byte)(((row[x * PIXEL_SIZE + 1]) + (row[x * PIXEL_SIZE + 2]) + (row[x * PIXEL_SIZE + 3])) / 3);
for (int i = 0; i < PIXEL_SIZE; i++)
row[x * PIXEL_SIZE + i] = grayScale;
}
}
bitmap.AddDirtyRect(new Int32Rect(0, 0, width, height));
bitmap.Unlock();
return bitmap;
}
Another way to to convert an image to gray scale is to set the RGB values of every pixel to the sum of 30% of the red value, 59% of the green value, and 11% of the blue value. Hope you find this useful.
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