private void ReadFromBitmap(Bitmap bmp)
{
using Bitmap tmp = new(bmp);
using Bitmap copy = tmp.Clone(new Rectangle(0, 0, tmp.Width, tmp.Height), PixelFormat.Format32bppArgb);
BitmapLocker lck = copy;
Scalar factor = new Scalar(255d).Inverse;
lck.LockPixels((px, w, h) =>
{
for (int i = 0, l = w * h; i < l; ++i)
{
_coefficients[i] = new Vector4(
px[i * 4 + 2], // r
px[i * 4 + 1], // g
px[i * 4 + 0], // b
px[i * 4 + 3] // a
) * factor;
}
});
}
public Bitmap ToBitmap()
{
Bitmap bmp = new(Width, Height, PixelFormat.Format32bppArgb);
BitmapLocker lck = bmp;
Scalar factor = 255;
lck.LockPixels((px, w, h) =>
{
for (int i = 0, l = w * h; i < l; ++i)
{
Vector4 col = _coefficients[i].Value;
px[i * 4 + 2] = (byte)col.X.Clamp().Multiply(factor); // r
px[i * 4 + 1] = (byte)col.Y.Clamp().Multiply(factor); // g
px[i * 4 + 0] = (byte)col.Z.Clamp().Multiply(factor); // b
px[i * 4 + 3] = (byte)col.W.Clamp().Multiply(factor); // a
}
});
return(bmp);
}