Correct preparation of PDF files
When creating a PDF in Acrobat Distiller, there are job options which must be set for commercial printing. These include default resolution, compression settings and font embedding.
Please ensure you choose high resolution. Compression settings for colour and greyscale should be downsampled to 300dpi with "auto compression" set on high. Bitmapped (monochrome: i.e. line art) images should be set at 600dpi. Font embedding should be set to "embed all fonts."
Make sure there is 3mm bleed all round the PDF, i.e. save the PDF with 6mm added to each measurement (i.e. for A4 usually 210mm x 297mm, save as 216mm x 303mm). Crop marks may be included. If it is not saved in this format, we will not be able to use it as artwork and if there are any changes to the job, you may have to amend and re-supply the artwork.
Artwork must be suppplied as CMYK for commercial printing, NOT RGB!
Please ensure that all embedded images are CMYK files please. RGB images may look good on your screen but final output to print is always in CMYK. One should be aware that files converted from RGB to CMYK may alter the colour composition significantly.
Microsoft Office & Publisher files
If you are creating a PDF from a MS Publisher or Word file, care must be taken to ensure spot colours are created correctly in your original documents. Do not set to RGB colours.
Supplying EPS files
Any other file formats not listed above must be saved as an eps or jpeg. If there are any changes to the job, you may have to amend and re-submit the artwork as we will be unable to change it. Ensure file has bleed and crop marks and please confirm the final size of the artwork and supply a hard copy for reference.
Bleed and crop marks
All artwork must have 3mm bleed if you require the image to bleed off the edge of the paper.
Crop marks should be included if artwork does not fill a whole page area (i.e. no bleed). They should be 5mm long, 3mm outside of the page area and coloured in the colour 'registration' to ensure they appear on each colour separation.
Please ensure that artwork is supplied at the correct finished size required. If this is not possible, please inform the printer to allow time for amending the artwork.
Artwork amendments or re-submission
Please remember that most printers charge for any amendments needed.
In General, please do not supply imposed pages or "printers pairs" because most printers workflow includes imposition software to impose correctly for their printing processes.
If you are supplying a document with multiple pages, please try and make the front and back cover of the document a separate file, and supply as single pages in page order. Also, please remember to allow for "creep" I suggest you keep all text and copy at least 5mm away from the trimmed edge.
Include all fonts you have used in the file. Whilst printers have extensive font collections, there is no guarantee the version you have used matches theirs. This can create problems with line lengths and spacing of the type.
Lineart and images
Scanned colour and greyscale images should be 300dpi at the final size in the document submitted for output.
Images should be submitted as TIFF's, JPEG's or EPS.
Lineart (bitmapped) should be 600-1200dpi at the final size in the document submitted for output.
Screen tints may range from 99% down to 1%.
From a practical viewpoint, anything above 90% or less than 5% will generally not be visible to the naked eye.