I have recently been asked a few times by printers to supply higher than standard quality files without a good explanation to why (aside from saying that the file size seems too small - but we all know file size is not always a good indicator of quality).
Here are the standards I go by:
Photography on photoprinter - 600ppi
Print for digital or offset printing - 300ppi
Large Format Print (close up viewing) - 100-150ppi
Large Format Print (6 feet+ viewing) - 80ppi
Billboard - 30ppi
Photography files I leave in RGB, all other print files for digital or offset printing I work in CMYK.
Are these still the standards? Has anything changed?
My understanding is that output dpi of the printer is the maximum quality possible, so a 600ppi file will not produce a better print than a 300ppi file if the output is 240dpi?
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