Resolving why 300 dpi CMYK image results in 1440 dpi in AFP output from EngageOne Designer
Software affected: EngageOne Designer / Generate
Issue
On creating a publication with a CMYK image of 300 dpi on an AFP output of 300dpi, the resulting output AFP file shows a 1440 dpi.
Cause
On creating a publication with a CMYK image of 300 dpi on an AFP output of 300dpi, the resulting output AFP file shows a 1440 dpi.
Resolution
UPDATED: October 19, 2017This is the expected behavior with AFP resolution.
AFP resolution
AFP conventionally employs the unusual image resolution of 1440 dots per inch or centimeter.
It refers to this as "Page units per unit base" (as in value 14400) with a "Page unit base" of 10 inches, where division of the former by the latter yields the dot resolution.
So for 240 units per inch, it will be 2400 units per unit base and for 1440 units per inch, it will be 14400 units per unit base.
More information are available through the links below.
http://www.outputlinks.com/SpecialInterest/AFPColorConsortium/modca08.pdf
http://people.bu.edu/rbs/Infoprint.QuickFacts
The attached file is more extensive as regards to the use of 1440.
AFP resolution
AFP conventionally employs the unusual image resolution of 1440 dots per inch or centimeter.
It refers to this as "Page units per unit base" (as in value 14400) with a "Page unit base" of 10 inches, where division of the former by the latter yields the dot resolution.
So for 240 units per inch, it will be 2400 units per unit base and for 1440 units per inch, it will be 14400 units per unit base.
More information are available through the links below.
http://www.outputlinks.com/SpecialInterest/AFPColorConsortium/modca08.pdf
http://people.bu.edu/rbs/Infoprint.QuickFacts
The attached file is more extensive as regards to the use of 1440.
