I like to have a handwritten logo in my 3D printed objects.
With surface it is possible to convert a png file into a 3D logo that you
can add or substract from flat surfaces. But I liked to have to logo on a
curved object.
So I made a curved logo in this way:

http://forum.openscad.org/file/n15260/democurvedlogo.png

The code is as follows:
//------------------------------------------------
// module to make a curved logo from a png file
//------------------------------------------------

curvedlogo(20,20);

module curvedlogo(diameter,lenght)
{

$fn=60;

translate([0,0,-diameter/2])
intersection()
    {
        // create a tube with 2* lenght and diameter
        difference()
        {
            rotate(90,[1,0,0]) 
              translate([0,0,-lenght]) 
               

cylinder(lenght*2,diameter/2+4,diameter/2+4,center=false);
rotate(90,[1,0,0])
translate([0,0,-lenght-0.1])

cylinder(lenght2+0.2,diameter/2,diameter/2,center=false);
}
// create a 3D logo with height diameter2
translate([0,0,diameter])
resize([lenght, lenght, diameter])
surface(file = "logob.png", center = true, invert=true,
convexity = 5);

}

}

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Good approach! If there was a function importing data into a matrix, one
could do really crazy things!

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That right it is very slow. It helped when I reduced the complexity of the
logo and first made and slt file of the logo, simplified it using Meshlab
and then import it.

Here is the result:
http://forum.openscad.org/file/n15263/barrel_met_logo.png

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Looks good. Another approach is to use Inkscape and its tools, to vectorise
your bitmap, and then export to openSCAD using a special extension.

• in inkscape the tool is under the Path menu and is called "Trace bitmap".
  (POTrace does the work and its code is avilable for other projects to
  include).
• The Extension is under "Generate from Paths" / "Paths to openSCAD".
• you need to install the Inkscape extension from here:
  • http://www.thingiverse.com/thing:1065500

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