Q Factor

[snapperanton]

I am working with Silverfast 6 and an Epson 4870 scanner. I am archiving a lot of past work (transparency/neg and print) which may also be used in the future for a book.

I usually scan at A3 size at 300DPI (48bit) but I am a little confused about how the Qfactor settings should be set, at present I set it to 1.5.

Can anyone shed a little light on the Q Factor? How it works with DPI etc.

thanks

[LSI_Noack]

Dear snapperanton

not much magic behind this one, it is a simple multiplier.
For more information on its purpose and / or uses, you might want to read the support article on SilverFast's scanning concept:
http://www.silverfast.com/show/scanningconcept/en.html

Kind regards
Sonny Noack
- tech support, LSI -

[seawolf]

If it is a simple multplier, is there no difference between a scan of: 2.0 Q-factor and 2000 lpi resulting in a 4000ppi image... and a scan of 1.0 Q-factor and 4000 lpi resulting in a 4000ppi image (all other factors equal)? If there is no difference, why even have a Q-factor?

[RAG]

Sonny,

Thanks for sharing that article! I found it explained the Q-Factor (multiplier) and Screen resolution (LPI) aspects of image resolution.

The Q-Factor and Screen LPI have an effect on the output resolution as well as the "scale" factor used. It is possible to change the variables and still get the same results. Analogous to 2+2=4, but 1+3=4 or 1X4=4 as well, right?