Adding text to image and save

问题:

In my program i allow the user to enter some text which then gets put on top of an image using the graphics.DrawString() method. When i then go to save this image, it saves it without the text.

How can i save both as one image?

I have seen a few examples but none of which have helped.

private void txtToolStripMenuItem_Click(object sender, System.EventArgs e)
    {
        Rectangle r = new Rectangle(535, 50, original_image.Width, original_image.Height);
        Image img = Image.FromFile("C:\\PCB.bmp");

        Bitmap image = new Bitmap(img);

        StringFormat strFormat = new StringFormat();

        strFormat.Alignment = StringAlignment.Center;
        strFormat.LineAlignment = StringAlignment.Center;

        Graphics g = Graphics.FromImage(image);

        g.DrawString("Hellooooo", new Font("Tahoma", 40), Brushes.White,
                r, strFormat); 

        image.Save("file_PCB.Bmp", ImageFormat.Bmp);
    }

回答1:

That's because you are creating a graphics object without a canvas. You are drawing on nothing, so there is nothing that is changed by your drawing the text.

First create a copy of the image (or create a blank bitmap and draw the image on it), then create a graphics object for drawing on that image:

Graphics g = Graphics.FromImage(image_save);

Then draw the text and save the image.

回答2:

You can try below code, we used it for watermark image.

System.Drawing.Image bitmap = (System.Drawing.Image)Bitmap.FromFile(Server.MapPath("image\\img_tripod.jpg")); // set image 

        Font font = new Font("Arial", 20, FontStyle.Italic, GraphicsUnit.Pixel);

        Color color = Color.FromArgb(255, 255, 0, 0);
        Point atpoint = new Point(bitmap.Width / 2, bitmap.Height / 2);
        SolidBrush brush = new SolidBrush(color);
        Graphics graphics = Graphics.FromImage(bitmap);

        StringFormat sf = new StringFormat();
        sf.Alignment = StringAlignment.Center;
        sf.LineAlignment = StringAlignment.Center;


        graphics.DrawString(watermarkText, font, brush, atpoint, sf);
        graphics.Dispose();
        MemoryStream m = new MemoryStream();
        bitmap.Save(m, System.Drawing.Imaging.ImageFormat.Jpeg);
        m.WriteTo(Response.OutputStream);
        m.Dispose();
        base.Dispose();