Error diffusion improves print quality, but it destroys image quality.
VP Hybrid CAD software provides a smooth filter command to correct low levels of error diffusion and is available on most VP products, including the working demos. Note the line edge distortions that will cause poor automatic vector conversions with severe line fragmentation, spurious lines, and impossible text recognition. By using VP Hybrid CAD 's powerful raster editor, the same image is restored to a high quality level for satisfactory raster-vector conversion. The above image shows the effects of error diffusion making image cleanup or automatic conversion to CAD impossible. This problem frequently shows up when scanning bluelines, mylars, and pencil drawings.