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RASTUS export plugin for stochastic screening

Copyright 1996-2006 Toby Thain,

A plug-in for Adobe Photoshop that creates high-resolution stochastically screened (screenless, also known as Frequency Modulation or error diffusion, similar to Agfa CristalRaster) bitmaps from halftone images.


RASTUS has proved ideal for producing high resolution (near-continuous tone) negatives for contact prints using alternative photographic processes, and "screenless" halftones for offset printing.

It has several advantages over in-RIP solutions:

  • low cost
  • works with any imagesetter
  • supports TIFF and EPS output
  • can produce output bitmap images larger than Photoshop's 30,000 pixel limit
  • uses interpolation for high quality results
  • can produce a variety of dot sizes (successfully tested on newsprint)
  • can create files with any number of separable channels in DCS 2.0 format
  • can be used to create "transparent" drop shadows and similar effects
  • a free evaluation version is available.

RASTUS is currently being used in many applications:

  • Platinum, palladium, and gum over platinum prints
  • Van Dyke and silver gelatin prints
  • Albumen prints
  • Photopolymer (solar) plates for letterpress
  • Photogravure plates (eliminating the dusting process)
  • Offset printing plates
  • Lenticular imagery.

RASTUS - Monochrome

Read what users have to say

RASTUS has the endorsement of several experts in alternative process printing. See this page for some comments or contact us for more information.

How to buy

Contact us for pricing.

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