OFFSET PRINTING
Job specification
- netto size
- number of pages
- paper stock
- number of colors (any color beyond CMYK palette should be Pantone specified)
- finishing (matt/glossy film, UV/aquaeous coating)
- binding method
- production run
Artwork format
- composite production-ready PDF, separated with a profile appropriate for chosen printing media. Standard preferred profiles are Coated Fogra39 for coated stock and Uncoated Fogra29 for uncoated stock.
- do not embed separation profiles in PDF files
CTP screening
- by default, all offset printing jobs have 175 lpi screen ruling
Selective UV varnish and diecuts
- selective varnish masks and diecut plots can be embedded in production files, but must be defined as an extra color (beyond CMYK), named appropriately (eg UV, diecut) and set to overprint - both fill and outline
General prepress rules
- bleeds must be set to 3 mm or more, around all pages
- resolution of raster graphics (eg photos) embdedded in production files should be approx. 270-300 ppi. Resolution lower than specified can degrade quality of printing.
- all extra colors, beyond CMYK palette must be Pantone specified
- minimum type height, reproduced with 1 color should be more than 6 pt;
- minimum type height when printed in reverse or as CMYK color, should be more 8 pt.
- minimum line weight is 0,2 pt.
- lines printed in reverse or with more than one color, should be thicker than 0,75 pt.
- recommended trap value is 0,05 mm (0,144 pt)
- important elements on page should offset 5 mm from trimming.
Signed certified digital proof is mandatory as a color reference.
Any jobs including hot-stamping, embossing, diecutting and varnishing should be accompanied with appropriate masks or outlines, provided in PDF files.
Only complete and error-free digital artworks are accepted.
