APRIL 2022
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GRAPHIC DESIGN, PRINTING, AND PUBLISHING
A “prepress proof,” on the other hand, is an analog or digital proof (hardcopy) that uses inkjet, toner, dyes, overlays,
photographic, film, or other techniques to give a close approximation of what the final document will look like when
printed. Unlike a press proof, the prepress proof does not use the actual printing inks therefore color proofs may not
be quite as accurate as a press proof.
A “soft proof” is where a copy of the output is proofed directly on the monitor. It is generally the first stage of
proofing. At this stage, further editing and corrections can be made and when the design is suitable, the file is
sent through a digital proofing system. A copy of the soft proof is output to be checked for correctness and once
approved, the job is sent to the digital equipment for output.
A “digital proofing system” involves printing each of the primary color components of an image through
a proofing device to create a full color digital proof. The different types of digital color proofing systems are
sublimation, thermal wax, ink-jet, color laser, and laser thermal.
A “digital proof” is a type of hardcopy sample output directly from digital files rather than from analog methods
(such as film), which is used by the client to verify the accuracy of their print application prior to the actual
production of the project.
“Raster image processor (RIP),” “rasterizing,” and “PostScript”
A “raster image processor” is a component (powerful computer) used in a printing system which “rasterizes” digital
information (text and images), such as that contained in a “PostScript” file, into a high-resolution raster image also
known as a bitmap (a type of graphic composed of pixels/dots). Each pixel or dot (pattern of spots) contains color
information for the image. In essence, the raster image processor is the device that converts the elements for the
digital print application into a format that can be understood by the printing press.
The term “rasterizing” means converting a raster image into dots, instead of lines. Unless the text and images
are printed on a vector graphics plotter, which literally draws the illustration with pens, all text and images must
be rasterized into a bitmap for display or printing. The rasterizing essentially interprets the digital information
(for example, PostScript code) into device specific language and then the information is converted to a single file
(prepress instruction) using the parameters of the destination printing press. How these dots (raster images) are
arranged on the page determines what you see and how the page looks.
“PostScript” is a programming or page description language, which describes what a page should look like
when printing. Many of the documents created by graphic designers and desktop publishers contain an intricate
combination of fonts and graphics that are best described using PostScript. A raw PostScript file looks like a text file
with all kinds of semi-understandable computer codes in it. The codes represent instructions to the printing device
about how to draw the graphics and how to format the text, what fonts to use, for example.
“Digital prepress instruction”
“Digital prepress instruction” converts electronic files produced by different computer programs into specific,
original instructions or information necessary to prepare and link files for the output of an image to film, plate,
or press. Generally, digital or electronic prepress instruction is accomplished using a Raster Image Processor (see
above) that combines and translates computer programs, including page layout files and linked graphics, into
specific instructions for the printer’s proprietary direct-to-film, direct-to-plate, or direct-to-press equipment.
Digital prepress instruction qualifies as a custom computer program and the charges associated with the creation
of the digital prepress files are not taxable provided the files are prepared to the special order of the customer.
As explained on the next page, digital prepress instruction does not include using a computer to create original
artwork or to scan, manipulate, or insert artwork.
Please note: Persons who provide digital prepress instruction or raster image processing are consumers of any items
used in the creation of the prepress instruction. Accordingly, the purchases of items used in creating the digital
prepress instruction, or the use of production aids that are not sold by the provider of digital prepress instruction
prior to use (for example, intermediate production aids and separations) are generally subject to tax.