The help that accompanies SewArt contains a mini-tutorial that describes the steps necessary to load input image files and convert them to embroidery files.

Converts images to high-quality embroidery files for sewing.Allows images in other (unsupported) file formats to be pasted into the SewArt workspace.Reads raster or vector format images (supported input formats include *.bmp, *.png, *.jpg, *.gif, *.svg, *.wmf, and *.emf).