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Professional Printing
(& Prepress)
What is Digital Printing?
Modern printing methods such as laser and ink-jet printing are known as
digital printing. It is a method where digital-based images are printed
directly to paper. In digital printing, an image is sent directly to the printing
machine using digital files such as PDFs and those from graphics software
such as Illustrator and InDesign. Much like your desktop print, professional
digital printers are, however, lots bigger and faster.
Digital print shops handle high
volume digital print jobs
Digital process eliminates the
need for a printing plate,
which is used in
offset printing.
What is Offset Printing?
Offset printing is a printing technique where the inked image is transferred (or
"offset") from a plate to a rubber blanket, then to a substrate surface, normally
paper. When used in combination with the lithographic process, which is based on
the natural antipathy of oil and water, the offset technique employs a flat image
carrier on which the image to be printed obtains ink from ink rollers, while the non-
printing area attracts a water-based film (called "fountain solution”), keeping the
non-printing areas ink-free.
What is Web Printing?
• Web offset is a form of offset printing in which a continuous roll of paper is fed
through the printing press. Pages are separated and cut to size after they have
been printed. Web offset printing is used for high-volume publications such as
mass-market books, magazines, newspapers, catalogs and brochures.
Offset or Digital:
Which is best?
Each type of printing method has its
own pros and cons.
Offset Printing Pros
 Ability to print larger quantities cost effectively
 Can print on a variety of surfaces. And use special colours where
four color process is not able to reproduce the required shade.
 Can better accommodate large runs
 You can include varnishes, diecuts, embossing
 Has a richer look and can accommodate more paper types
Offset Printing Cons
 The process requires more time for work to dry before finishing
 Costs more than digital presses for low runs
 Slower turnaround times
 More expensive
Digital Printing Pros
 Faster than lithographic printing for smaller quantities
 Can print in small quantities – ideal when not needing bulk runs of
printed material
 More accuracy on prints when compared to the original design
 Each print can be customised and can be different in any way
from the previous copy
Digital Printing Cons
 Although much improved over recent years, digital printing quality
is still inferior to lithographic offset printing
 Can’t print large runs at lower cost
Offset Printing Process
Offset steps: pre-press
Before the job can be printed offset, your document must be
converted to plates. The plates are created from the digital file. Each
of the ink colors - black, cyan, magenta, and yellow - has a separate
plate.
Plates may be aluminium or paper.
Before treatment
After treatment
Pro printing
Print colour
 Print color is created by mixing halftone percentages of
process (CMYK) colors.
C80%/M20% C60%/M40% C40%/M60% C20%/M80%
Print density
 Print density (darkness) is created by increasing the inked area
(halftone percentage)
Black 20% Black 40% Black 60% Black 80%
Screening
One half-tone image may
contain thousands of
different shades………
Examples of screening methods
Staccato 25µm Conventional 60 l/cm
Pro printing
Paper Size Issues
• Print publication (book/magazine/newspaper/
newsletter)formats are based on standard flat
sheet paper size, folded, bound, or saddle-
stitched.
• Examples:
• 11 x 17 sheet double-fold (either 4 or 8 page
newsletter)
• 8 ½ x 11 magazine in signatures (groups of
8 pages)
• Decisions made about format affect cost
• Printers create in signatures of 8 pages or a
codex of 16.
So you must work in multiples of 4!
2nd step: press run
Sheet paper is fed through the press. The image area of the plate picks up
ink from the ink rollers. The water rollers keep the ink off of the non-image
areas of the plate.
Each plate transfers its image to a rubber blanket that in turn transfers the
image to the paper. The plate itself does not actually touch the paper - thus
the term "offset" lithography. All of this occurs at an extremely high speed.
A typical Heidelberg press
can run at 15,000
impressions an hour.
Chill rolls
Specialty printers for various types of jobs introduce unique technologies
Here, chill rolls cools down a web press run and solidify the ink binder
Steel cylinders (3 - 6) with cold water are pumped through
Print definition depends on paper quality
Coated Fine,
70l/cm
SC,
54l/cm
LWC,
60l/cm
Newsprint,
48l/cm
After the 4 printing set-ups
3rd step: finishing
When presses have finished the printing process:
Papers are trimmed to the final size using guillotines.
The cut papers can be
• left as they are for flyers, leaflets
• collated and folded for folded leaflets
• bound, stitched and laminated for books and booklets.
Shown—pro collator
Post-press
Bindery
Booklets may be…
– perfect bound (glued)—above 100 pages
– Saddle stitched (stapled/sewn) typically less than
100 pages
Mechanicals
• Digital files prepared using industry-standard software, and including
all links, photographs and/or illustrations, font folders and image
folders. (Often, an InDesign, Photoshop, Illustrator file, final JPG, or a
PDF.) Also called digital prepress files.
• It is important to keep in mind that what may be an easy trial and
error process for printing at home becomes a costly transaction once
it moves outside of your control to other working professionals.
• For this reasons, further study should include not only mastery of the
specific program you have chosen to work with but also more
detailed information concerning prepress preparation and printing
technologies.
Bleeds, etc.
Bleed--a printing term referring to type or a visual that extends
off the edges of the page. To allow for deviations in trimming the
document after printing an element that bleeds is extended
about 1/8 inch or 1 pica beyond the trim lines (page edge). A
bleed is set up with printers marks.
Printers Marks
B. Registration mark
C. Page information
D. Trim marks
E. Color bar
F. Tint bar
Designing Art for a Bleed
• The important thing when working in Photoshop with a photo
that will bleed off a document page is to remember not to
crop the photo so close that losing a ½ inch all around will ruin
your image. Leave lots of active margin space and do your
cropping in InDesign.
Definitions
Packaging—Going into the FILE menu in InDesign, Photoshop,
and Illustrator to create a folder to store all your links, fonts, and
original images used so they can be installed on computers
where other folks are opening your file.
Rich black—A combination of colors preferred by professional
printers for greater richness and darker tone in depicting solid
black. Rich black is typically made up of 100 percent black, 60
percent cyan, 40 percent magenta, and 40 percent yellow.
Reverse type—White type. In printing, reverse type appears
white by “reversing out of” the ink to the paper—in other words,
containing no ink and thereby appearing white.
Definitions
“Rich Black”
In printing, there are many different types of black you can use (RGB,
Photoshop, neutral rich, registration, flat, designer, etc.) Printers refer often to
“rich black” which is not 100 percent black but includes some other colors in it
for richness (typically 100K, 60C, 40M, 40 Y).
This is an ink mixture of solid black over the other CMYK color that results in a
darker tone than black ink alone generates in the printing process. You can
choose rich black in your Adobe programs.
However, if you need small text knocked-out of a black background, make sure
that it doesn’t include these amounts of cyan, magenta and yellow. If you do,
the text will print blurred. This will happen because of ink-bleed and possible
slight misalignment of printing plates. For best results here, use white text on
a background that only has black in it.
Prepress Issues
PREPARING MECHANICALS FOR PRINT
• Files destined for print should be set to 300dpi. DPI stands for
Dots Per Inch.
• As designer Franz Jeitz advises: "When it comes to printing,
especially large format printing, vectors are your friend. Try
to design as much as possible in a vector based program
such as Adobe Illustrator. Not only will it reduce your file size,
but it will ensure that you get the crispest print result.”
• CMYK (Cyan-Magenta-Yellow-Black color process) is used for
print materials. Check your color modes.
• Run a pre-print check. In InDesign this is known as a “Pre-
flight” and it will bring up any issues such as RGB files being
used or fonts used that aren’t embedded.
Prepress Issues
PACKAGING
In InDesign, Photoshop, and Illustrator, packaging means you
create a folder to store all your links, fonts, and original images
used to be installed on computers where other folks are opening
your file. The command for creating this folder is in the
program’s FILE menu.
Formatting InDesign documents for press--
(Oft overlooked formatting requirements)
1. Any black and white images should be converted to grayscale.
Otherwise, cyan, magenta and yellow inks will be added when
your image when printed. Particularly important if your printer
plans to use only black ink on some pages.
2. InDesign files sent to offset press should use only JPG
photos. Gif and png files are on-screen-only file formats not
intended for print and will not print well. (Gif and pngs are 72 ppi
and images for print need to be in the 300-400 dpi range.)
Formatting InDesign documents for press--
3. Flatten your layers. If you fail to flatten layers before you
export to PDF your file will be huge. Your artwork should still
print okay, but it will bloat your file size and may send your
printers’ Macs into meltdown.

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Pro printing

  • 2. What is Digital Printing? Modern printing methods such as laser and ink-jet printing are known as digital printing. It is a method where digital-based images are printed directly to paper. In digital printing, an image is sent directly to the printing machine using digital files such as PDFs and those from graphics software such as Illustrator and InDesign. Much like your desktop print, professional digital printers are, however, lots bigger and faster. Digital print shops handle high volume digital print jobs Digital process eliminates the need for a printing plate, which is used in offset printing.
  • 3. What is Offset Printing? Offset printing is a printing technique where the inked image is transferred (or "offset") from a plate to a rubber blanket, then to a substrate surface, normally paper. When used in combination with the lithographic process, which is based on the natural antipathy of oil and water, the offset technique employs a flat image carrier on which the image to be printed obtains ink from ink rollers, while the non- printing area attracts a water-based film (called "fountain solution”), keeping the non-printing areas ink-free.
  • 4. What is Web Printing? • Web offset is a form of offset printing in which a continuous roll of paper is fed through the printing press. Pages are separated and cut to size after they have been printed. Web offset printing is used for high-volume publications such as mass-market books, magazines, newspapers, catalogs and brochures.
  • 5. Offset or Digital: Which is best? Each type of printing method has its own pros and cons.
  • 6. Offset Printing Pros  Ability to print larger quantities cost effectively  Can print on a variety of surfaces. And use special colours where four color process is not able to reproduce the required shade.  Can better accommodate large runs  You can include varnishes, diecuts, embossing  Has a richer look and can accommodate more paper types
  • 7. Offset Printing Cons  The process requires more time for work to dry before finishing  Costs more than digital presses for low runs  Slower turnaround times  More expensive
  • 8. Digital Printing Pros  Faster than lithographic printing for smaller quantities  Can print in small quantities – ideal when not needing bulk runs of printed material  More accuracy on prints when compared to the original design  Each print can be customised and can be different in any way from the previous copy
  • 9. Digital Printing Cons  Although much improved over recent years, digital printing quality is still inferior to lithographic offset printing  Can’t print large runs at lower cost
  • 11. Offset steps: pre-press Before the job can be printed offset, your document must be converted to plates. The plates are created from the digital file. Each of the ink colors - black, cyan, magenta, and yellow - has a separate plate. Plates may be aluminium or paper.
  • 14. Print colour  Print color is created by mixing halftone percentages of process (CMYK) colors. C80%/M20% C60%/M40% C40%/M60% C20%/M80%
  • 15. Print density  Print density (darkness) is created by increasing the inked area (halftone percentage) Black 20% Black 40% Black 60% Black 80%
  • 16. Screening One half-tone image may contain thousands of different shades………
  • 17. Examples of screening methods Staccato 25µm Conventional 60 l/cm
  • 19. Paper Size Issues • Print publication (book/magazine/newspaper/ newsletter)formats are based on standard flat sheet paper size, folded, bound, or saddle- stitched. • Examples: • 11 x 17 sheet double-fold (either 4 or 8 page newsletter) • 8 ½ x 11 magazine in signatures (groups of 8 pages) • Decisions made about format affect cost • Printers create in signatures of 8 pages or a codex of 16. So you must work in multiples of 4!
  • 20. 2nd step: press run Sheet paper is fed through the press. The image area of the plate picks up ink from the ink rollers. The water rollers keep the ink off of the non-image areas of the plate. Each plate transfers its image to a rubber blanket that in turn transfers the image to the paper. The plate itself does not actually touch the paper - thus the term "offset" lithography. All of this occurs at an extremely high speed. A typical Heidelberg press can run at 15,000 impressions an hour.
  • 21. Chill rolls Specialty printers for various types of jobs introduce unique technologies Here, chill rolls cools down a web press run and solidify the ink binder Steel cylinders (3 - 6) with cold water are pumped through
  • 22. Print definition depends on paper quality Coated Fine, 70l/cm SC, 54l/cm LWC, 60l/cm Newsprint, 48l/cm
  • 23. After the 4 printing set-ups
  • 24. 3rd step: finishing When presses have finished the printing process: Papers are trimmed to the final size using guillotines. The cut papers can be • left as they are for flyers, leaflets • collated and folded for folded leaflets • bound, stitched and laminated for books and booklets. Shown—pro collator
  • 26. Bindery Booklets may be… – perfect bound (glued)—above 100 pages – Saddle stitched (stapled/sewn) typically less than 100 pages
  • 27. Mechanicals • Digital files prepared using industry-standard software, and including all links, photographs and/or illustrations, font folders and image folders. (Often, an InDesign, Photoshop, Illustrator file, final JPG, or a PDF.) Also called digital prepress files. • It is important to keep in mind that what may be an easy trial and error process for printing at home becomes a costly transaction once it moves outside of your control to other working professionals. • For this reasons, further study should include not only mastery of the specific program you have chosen to work with but also more detailed information concerning prepress preparation and printing technologies.
  • 28. Bleeds, etc. Bleed--a printing term referring to type or a visual that extends off the edges of the page. To allow for deviations in trimming the document after printing an element that bleeds is extended about 1/8 inch or 1 pica beyond the trim lines (page edge). A bleed is set up with printers marks.
  • 29. Printers Marks B. Registration mark C. Page information D. Trim marks E. Color bar F. Tint bar
  • 30. Designing Art for a Bleed • The important thing when working in Photoshop with a photo that will bleed off a document page is to remember not to crop the photo so close that losing a ½ inch all around will ruin your image. Leave lots of active margin space and do your cropping in InDesign.
  • 31. Definitions Packaging—Going into the FILE menu in InDesign, Photoshop, and Illustrator to create a folder to store all your links, fonts, and original images used so they can be installed on computers where other folks are opening your file. Rich black—A combination of colors preferred by professional printers for greater richness and darker tone in depicting solid black. Rich black is typically made up of 100 percent black, 60 percent cyan, 40 percent magenta, and 40 percent yellow. Reverse type—White type. In printing, reverse type appears white by “reversing out of” the ink to the paper—in other words, containing no ink and thereby appearing white.
  • 32. Definitions “Rich Black” In printing, there are many different types of black you can use (RGB, Photoshop, neutral rich, registration, flat, designer, etc.) Printers refer often to “rich black” which is not 100 percent black but includes some other colors in it for richness (typically 100K, 60C, 40M, 40 Y). This is an ink mixture of solid black over the other CMYK color that results in a darker tone than black ink alone generates in the printing process. You can choose rich black in your Adobe programs. However, if you need small text knocked-out of a black background, make sure that it doesn’t include these amounts of cyan, magenta and yellow. If you do, the text will print blurred. This will happen because of ink-bleed and possible slight misalignment of printing plates. For best results here, use white text on a background that only has black in it.
  • 33. Prepress Issues PREPARING MECHANICALS FOR PRINT • Files destined for print should be set to 300dpi. DPI stands for Dots Per Inch. • As designer Franz Jeitz advises: "When it comes to printing, especially large format printing, vectors are your friend. Try to design as much as possible in a vector based program such as Adobe Illustrator. Not only will it reduce your file size, but it will ensure that you get the crispest print result.” • CMYK (Cyan-Magenta-Yellow-Black color process) is used for print materials. Check your color modes. • Run a pre-print check. In InDesign this is known as a “Pre- flight” and it will bring up any issues such as RGB files being used or fonts used that aren’t embedded.
  • 34. Prepress Issues PACKAGING In InDesign, Photoshop, and Illustrator, packaging means you create a folder to store all your links, fonts, and original images used to be installed on computers where other folks are opening your file. The command for creating this folder is in the program’s FILE menu.
  • 35. Formatting InDesign documents for press-- (Oft overlooked formatting requirements) 1. Any black and white images should be converted to grayscale. Otherwise, cyan, magenta and yellow inks will be added when your image when printed. Particularly important if your printer plans to use only black ink on some pages. 2. InDesign files sent to offset press should use only JPG photos. Gif and png files are on-screen-only file formats not intended for print and will not print well. (Gif and pngs are 72 ppi and images for print need to be in the 300-400 dpi range.)
  • 36. Formatting InDesign documents for press-- 3. Flatten your layers. If you fail to flatten layers before you export to PDF your file will be huge. Your artwork should still print okay, but it will bloat your file size and may send your printers’ Macs into meltdown.