Black-and-white forms with raster borders
These forms have no background. All field borders (borders of character cells, checkmark fields and other form elements) are made up of raster lines, i.e. sequences of small black dots. Raster dot size is usually 0.39-0.5 pt. The recommended size is 0.39 pt, with the distance between the raster dots being at least five times greater than the dot size. The size of the dots and distance between them are crucial, because a raster background is removed during despeckling rather than during scanning: the program will treat the dots as garbage and remove them. The dots should therefore not be glued together on scanned images.