After a file has been designed and completed, it is to be saved in TIFF format in Photoshop at 300 dpi in CMYK mode for commercial printing. Various profiles may be used to reduce dot gain in printing. For web offset printing 150 dpi may be sufficient though some web offset printing may go up to even 250 dpi. Dpi (dots per inch) as a rule has to be about twice the lpi (lines per inch). Sheet fed offset printing is normally done in 150 or 175 lpi. Therefore it needs about 300 dpi files. Web offset on the other hand is done in about 75 lpi to 100 lpi so they may need only about 150 to 200 dpi files. However all files have to be in CMYK mode.
Posted under Offset Printing
This post was written by admin on September 4, 2008
