Most DTP software will come with a Press Quality PDF export option, these are generally fine and require no modification. We prefer to use ZIP for colour and greyscale image compression, and 300 DPI resolution produces excellent results, we are happy to accept files with a resolution up to 600 DPI, however anything above this will result in bloated files and no improvement in final print quality.
We recommend images have a minimum resolution of 300 DPI, we can accept images with a lower resolution lower than this. If we detect images with low resolution, will advise you, however we understand it is not always possible to
All artwork should be in CMYK, and if you are using colour profiling, we recommend “Coated FOGRA39″ profile. We have a maximum ink density of 330%, we can accept files with higher ink density, but automatic black reduction will be used going to press. We cannot accept files with an ink density of 400%.