Цитата:
Сообщение от Eriksson
PEACE, Look at the picture at high magnification, with a good magnifying glass.
If it is printed - you can see the raster, ie, dots that make up the image. If the picture - that, therefore, it will be a line.
Good luck! 
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This is only true if the offset printing. In addition to offset up to relatively recently, there were a number of other printing techniques that do not use a raster (intaglio printing, photoengraving, zincography, etc.) for reprodutsirovniya images in industrial mastshtabah. Not to mention the large number of intrinsic artistic printing techniques (lithography, etching, woodcut, etc.).
My tediousness has only one purpose: to say that
lack of a raster in the image does not guarantee its uniqueness.
On this same special case shows that, most likely this figure, although it may lithography (method must be visible characteristic melkotochechnaya lithographic stone structure, but not regular, like a screen, and as if imitating a feather on the rough paper)