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); }