09. The importance of spellcheck
Luke Woodhouse advises that you to "spellcheck, spellcheck, spellcheck. Then get your mum to spellcheck it and anyone else who will read it for you. There's nothing more soul-destroying than a typo, and they're easy to miss if you're too close to your masterpiece."
10. What is 'bleed'?
'Bleed' is simply a little area (usually 3 or 5mm) around the edge of your poster design that (depending on how the printer cuts the paper down) may or may not be shown in the finished result. It's essentially your room for error and ensures there isn't a random white line on the edges of your printed poster.
Programs such as InDesign and QuarkXPress make it easy by showing you guides, so you can see where the bleed starts and finishes. Always ask the printer you're using (or check your own printer settings) to determine how much bleed is required.
11. What is 'trim'?
The trim is the edge of the final printed output. To prevent text and logos being chopped off the final output they should be placed with some breathing space around them, and no closer to the trim edge than 1/8in.
12. Use vectors
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."
13. Check your fonts
Always run a pre-print check. This will bring up any issues, such as RGB files being used or fonts used that aren’t embedded. In InDesign this is known as a 'pre-flight'. The programme can package up all your print files and links ('File > Package') into one folder, which will spare you any missing font nightmares.
14. Get your blacks right for poster printing
Ben Powell suggests: “When printing posters using black, there are so many different types of black you can use (RGB, Photoshop, neutral rich, registration, flat, designer, and so on).
"My tip would be to avoid RGB black as this is primarily used for the web/digital and will look washed-out and grey in print. Which black you should use will depend entirely on your printing process and what paper stock you're using, especially if you're printing solid blacks.
"When I designed a recent infographic piece, I spent days printing various different blacks on different stocks of paper to get the most accurate black whilst making sure the colours didn't bleed into each other; a really lengthy but worthwhile process. Always leave plenty of time to test your blacks – it can completely ruin a fantastic poster design if you don't."