Image annotation

Question

I am new to the imaging. Could any body provide information on Image annotation. is there any free tools available. I want to put some annotation on the image. anntotation might be some textual information or some drawing objects like rectangle, circles or line. How to do this ? give me some examples in terms of code. Thanks

spgilmore · Answer

GDI+ is a means of drawing text, images and primitives onto a surface. It also provides the means to create the surface and to save it to a graphics file. GDI+ surfaces are instances of the Graphics class. These surfaces provide methods to draw on them. This example loads a bitmap from disk, draws a solid box in the upper-left corner and write "GDI+ Test" in the box, then saves the bitmap to a new file. private void button4_Click(object sender, System.EventArgs e) { //get a surface with an image on it. Bitmap bmp = new Bitmap("c:\delme.bmp"); Graphics g = Graphics.FromImage((Image) bmp); //annotate image string s = "GDI+ Test"; Font myfont = new Font("Courier New", 24, FontStyle.Bold); Brush mybrush = Brushes.Red; //draw the box SizeF boxsize = g.MeasureString(s, myfont); g.FillRectangle(Brushes.Blue, 0, 0, boxsize.Width, boxsize.Height); //draw the text g.DrawString(s, myfont, mybrush, 0, 0); //save the annotated image to disk. bmp.Save("c:\delme2.bmp"); }

Image annotation

Answers (1)