What Happens to Dots and Smudges?
During initial scanning, the “de-speckle” facility will remove some dots etc but not always all. A level has to be struck above which the program is instructed to ignore dots, as they may be data. If the image has been scanned in Greyscale at 8 bit, there will be 256 levels of grey. It is possible to delete some grey levels e.g. “smudges” and then convert back to “lineart” i.e. one bit depth as black or white. However, for “clean” drawings this is not necessary. Once smudges and speckles have been removed at the raster stage, conversion to vector format takes place. Everything the conversion program recognises as on entity is converted. Hence, “dirty” drawings may have many small lines or dots and squiggles that have been translated from original dots and smudges. These can simply be “windowed” in the CAD package and deleted to remove them. Post “vectorisation” cleaning by the operator is not normally included within the conversion price as its requirement is subjective and the extent
