Technical notes on folded brochure design
When designing quad-fold brochures, create a document containing 2 pages (one for the outer side and one for the inner side). Page size must be that of the brochure open flat. For example, if you are going to print finished-size 10x21 cm brochures, open size must be 60x21 cm and all panels have to be the same width (10 cm) in the case of accordion folds.
The bleeding area width has to be 3 mm, and elements that are going to bleed off must stick out 3 mm beyond the page edges. It is advisable to respect a safety margin of 3 to 5 mm around the 4 page edges, in which no element should be placed (other than those that extend out of the page). It is essential to respect this rule; otherwise, when trimming the brochure, elements placed very close to the paper edge may be partially or totally sliced.
When designing 6-panel brochures, panel width has to be considered in order to precisely place the design elements that have to match the folding lines.
What can we say about image resolution? When we talk about images, we are referring to pictures and logos. It is obvious that image resolution must be high enough as to guarantee quality reproduction. It is not advisable to download images from the internet and place them in our document. Keep in mind that the resolution of images intended to be used on screen (72 dots per inch) is lower than the optimal resolution for image printing. If you download images from the web, you might find and unpleasant surprise: pixelation, which greatly undermines the job's overall quality. It is worth working with good quality pictures.