C#•2y ago

❔ Bitmap created from graphics appears to be all black

I have some kind of drawing board in winforms. User draws into panel with graphics and than i want to save the image into file. relevant parts of code are (canvas is the name of the panel the user is drawing on):

Graphics graphics;
Pen pen;
Bitmap bmp;

public Form1()
{
  InitializeComponent();
  graphics = canvas.CreateGraphics();
  pen = new Pen(Color.Black, 35);
  bmp = new Bitmap(28, 28, graphics);
}

private void btnSave_Click(object sender, EventArgs e)
{
  var fileName = "digit.png";
  bmp.Save(fileName,ImageFormat.Png);
}

Graphics graphics;
Pen pen;
Bitmap bmp;

public Form1()
{
  InitializeComponent();
  graphics = canvas.CreateGraphics();
  pen = new Pen(Color.Black, 35);
  bmp = new Bitmap(28, 28, graphics);
}

private void btnSave_Click(object sender, EventArgs e)
{
  var fileName = "digit.png";
  bmp.Save(fileName,ImageFormat.Png);
}

but the saved image is all black, any ideas why?

1 Reply

Accord•2y ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ Bitmap created from graphics appears to be all black