ABOUT PORTABLE DOCUMENT FORMAT (PDF)
Its a flexible and convenient file to work with.
Its device independent i.e. it can be viewed on a computer,
mobile device, etc. without any defects.
Small in size, but completely self-contained, meaning you can
convert your file to PDF without compromising quality.
Its designed for the transfer of documents between different
operating systems e.g. Mac Os, Windows, Unix etc.
Designed to overcome incompatibly problems or inability to
read fonts etc.
PDF file is a platform independent file, and can be viewed and
printed on Mac, Dos, Win or Unix systems.
All graphics, fonts and elements are embedded.
It allows the sharing of the most complex information between
different operating systems.
PDFs are also suitable for those who wish to have a
publication in electronic format while still maintaining the
Correctly configured PDF files are reliable and predictable,
and therefore create efficient workflow.
Composite PDF files limit the last minute editing of text,
PDFs are the preferred way of working for large printing
CREATING A PDF
creating a PDF use ZIP (no loss of information) image
compression instead of JPEG (significant loss of information
dependent on quality setting). Your file will be larger but the
upside is that there will be no loss of quality. Under
circumstances where disc space / bandwidth is not an issue turn
compression off altogether (this will allow for faster file
processing). Ideally JPEG compression should only be used for
PDFs that will be used on the web.
If your PDF export dialogue box has a colour setting window
make sure that the colour management is set to leave the colour
unchanged. If you choose RGB your file will be useless and if
you choose CMYK any spot colours you may have used will convert
Always embed all fonts. Due to licence restrictions on some
fonts, not all fonts can be imbedded, its best to convert
strange fonts and symbols to curves / path / outlines.
Make sure your file contains no OPI links or DCS files before
exporting them as PDF. These are only meant to be low resolution
placeholders for high resolution images. Confirm that the high
resolution image has been embedded into the PDF.
ABOUT VECTOR & RASTER IMAGES: (PSD VS EPS VS TIFF VS JPEG)
Encapsulated PostScript, or EPS file format is the preferred
format for importing vector-based images. When saving a Vector
image in EPS format no changes are made to the original file
It is the universal way of saving files from FreeHand and
Illustrator and is often the best method for saving raster
images from PhotoShop.
The EPS file format allows the use of clipping paths to mask
objects, the saving of Duotones with Pantone Colours or files
with spot colours & the option for saving whites as transparent.
This enables users to set the background colour later in a page
Document is the smartest and most reliable method for saving
files from PhotoShop for import into programmes that support the
file format (e.g. InDesign). PSD supports transparent
backgrounds and layers.
are compressed versions of bitmapped images. The quality is
lower (in varying degrees depending on the quality setting
chosen) than that of EPS or TIFF files and the format should be
used with caution when files are saved with printing in mind. A
definite no-no is to open a JPEG file and then resave it as a
JPEG as the quality of the file deteriorates dramatically with
each save. It is more suited to web applications where quality
is not as important as speed.
Image File Format, or TIFF, offers a convenient means of saving
graphics that are scanned or generated electronically. It
supports only bitmap images and cannot be used for vector
images. Grayscale or Bitmap images saved as TIFFs can be altered
after being imported into programmes by manipulating certain
attributes (for example colouring the image) TIFF supports LZW
compression (no data or quality is lost) but this feature should
not be used when sending files for platemaking consider
sending PDFs instead.