Save changes in PixelCollection to image?

[hunterlan]

Hi!

I'm writing realization of LSB(Least Significant Bit) by using Magick.NET and I faced with problem, how to save changes, which was done in PixelCollection.

It's my code:

        public bool EncodeTextToImage(string text, string path)
        {
        int length = Math.Min(text.Length, 255);
        MagickImage image = null;
        try
        {
            image = new MagickImage(path);
        }
        catch
        {
            return false;
        }
        
        for (int i = 0; i < ONE_BYTE; i++)
        {
            var pixels = image.GetPixels();
            var color = pixels[i, image.Height - 1].ToColor();
            byte red = color.R;

            red = Convert.ToByte( (red & 254) | ((length & (1 << i)) > 0 ? 1 : 0) );
            var newColors = new MagickColor
            {
                A = color.A,
                B = color.B,
                G = color.G,
                K = color.K,
                R = red
            };
            pixels.SetPixel(new Pixel(i, image.Height - 1, newColors.ToByteArray()));
        }

        int x = ONE_BYTE;
        int y = image.Height - 1;
        for (int i = 0; i < length; i++)
        {
            int character = text[i];
            for (int j = 0; j < ONE_BYTE; j++)
            {
                if (x >= image.Width)
                {
                    y--;
                    x = 0;
                }
                var pixels = image.GetPixels();
                var color = pixels[x, y].ToColor();
                byte red = color.R;

                red = Convert.ToByte( (red & 254) | ((character & (1 << i)) > 0 ? 1 : 0) );
                var newColors = new MagickColor
                {
                    A = color.A,
                    B = color.B,
                    G = color.G,
                    K = color.K,
                    R = red
                };
                pixels.SetPixel(new Pixel(i, image.Height - 1, newColors.ToByteArray()));
                x++;
            }
        }

        string[] result_path = path.Split('.');
        result_path[0] = string.Concat(result_path[0], "_resultEncrypting.");
        try
        {
            image.Write(string.Concat(result_path));
        }
        catch
        {
            return false;
        }
        return true;
    } 

When I set pixels, this changes doesn't apply to variable "image". I tried to assign new MagickImage to "image", and pass to constructor array of byte, but, it throws error (different errors, depends on which constructor I will choose).

So, how can I save it?

[dlemstra]

Why do you think that the pixels are not changed? Your sample does not include enough information for me to test your code on my machine.

p.s. you should .Dispose() / using the image and the pixels.

[hunterlan]

Sorry, for long answer.

I'm not sure, that I wrote my code correctly. I will put down all source code.

LSB.cs
Program.cs