Category: workshops

A self portrait for Trenton Computer Festival

This was created for my recent talk on 5 ways to enhance your digital photos at Trenton Computer Festival as a lead-in slide. I wanted to introduce myself, show something dramatic, and show people what I meant, exactly, as image enhancement, as opposed to let’s say focus brightness, and contrast, though I showed those things too.

In Inkscape, I used the trace bitmap tool to convert my image in two ways, once in threshold mode, and once in detect edges mode. As a result, I get a slightly layered deeper image, and I definitely get something that’s difficult to capture with a camera. Thanks for checking it out!

Tracing Bitmaps in Inkscape

“Currently Inkscape employs the Potrace bitmap tracing engine (potrace.sourceforge.net) by Peter Selinger. In the future we expect to allow alternate tracing programs; for now, however, this fine tool is more than sufficient for our needs.  Keep in mind that the Tracer’s purpose is not to reproduce an exact duplicate of the original image; nor is it intended to produce a final product. No autotracer can do that. What it does is give you a set of curves which you can use as a resource for your drawing.  Potrace interprets a black and white bitmap, and produces a set of curves. For Potrace, we currently have three types of input filters to convert from the raw image to something that Potrace can use.  Generally the more dark pixels in the intermediate bitmap, the more tracing that Potrace will perform. As the amount of tracing increases, more CPU time will be required, and the element will become much larger. It is suggested that the user experiment with lighter intermediate images first, getting gradually darker to get the desired proportion and complexity of the output path.  To use the tracer, load or import an image, select it, and select the Path > Trace Bitmap item, or Shift+Alt+B.” – Inkscape tutorial: Tracing | Inkscape,