how draw border on round image png?

Le rner

hi all, can anybody help me to draw a thick border around round png.

Bitmap bmp = new Bitmap(@"C:\Users\Ali\Desktop\1.png");
int w = bmp.Width;
int h = bmp.Height;
Lst_Data lastpointcolor = new Lst_Data() ;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
Color c = bmp.GetPixel(x, y);
if (c.A != Color.Transparent.A)
{
if (lastpointcolor.color.A == Color.Transparent.A)
{
bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
}
}
lastpointcolor = new Lst_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
}
}

        for (int y = h-1; y > 0; y--)
        {
            for (int x = w-1; x > 0; x--)
            {
                Color c = bmp.GetPixel(x, y);
                if (c.A != Color.Transparent.A)
                {
                    if (lastpointcolor.color.A == Color.Transparent.A)
                    {
                        bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
                    }
                }
                lastpointcolor = new Lst\_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
            }
        }
        pictureBox1.Image = bmp;
    }

public struct Lst_Data
{
public Point point;
public Color color;
}

thanks in advance.

Pete OHanlon

What technology are you using? WinForms? WPF? Other?

Advanced TypeScript Programming Projects

Le rner

winform i m taking help from this article https://stackoverflow.com/questions/15858002/drawing-a-border-on-an-image[^] i also want to set different width of border.

Lost User

Le@rner wrote:

i m taking help from this article

Then you should ask the person who wrote the article. As it stands you have not provided any useful information for people to help you.

Le rner

Bitmap bmp = new Bitmap(@"C:\Users\Ali\Desktop\1.png");
int w = bmp.Width;
int h = bmp.Height;
Lst_Data lastpointcolor = new Lst_Data() ;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
Color c = bmp.GetPixel(x, y);
if (c.A != Color.Transparent.A)
{
if (lastpointcolor.color.A == Color.Transparent.A)
{
bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
}
}
lastpointcolor = new Lst_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
}
}

        for (int y = h-1; y > 0; y--)
        {
            for (int x = w-1; x > 0; x--)
            {
                Color c = bmp.GetPixel(x, y);
                if (c.A != Color.Transparent.A)
                {
                    if (lastpointcolor.color.A == Color.Transparent.A)
                    {
                        bmp.SetPixel(lastpointcolor.point.X, lastpointcolor.point.Y, Color.Red);
                    }
                }
                lastpointcolor = new Lst\_Data() { point = new Point(x, y), color = bmp.GetPixel(x, y) };
            }
        }
        pictureBox1.Image = bmp;
    }

public struct Lst_Data
{
public Point point;
public Color color;
}

can anybody help to draw more thick border around the image

Lost User

You should have added that to your original question, and add an explanation of what is wrong.

Lost User

You draw an ellipse and place it "over" the image where the border would be. (Images aren't "round"; they're rectangles with transparent backgrounds that simulate a particular shape). [Graphics.DrawEllipse Method (System.Drawing) | Microsoft Docs](https://docs.microsoft.com/en-us/dotnet/api/system.drawing.graphics.drawellipse?view=dotnet-plat-ext-6.0)

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