300dpi vs 350dpi and 150lpi vs 175 lpi

Hi.

I've always worked by the age-old rule of 2x the line-screen. So if printing with a 150lpi the optimal resolution of your artwork should be 300dpi, and if printing with a 175lpi the optimal resolution of your artwork should be 350dpi.

The majority of our scanning and printing is handled in the Far East. One of our most used repro-houses has suggested that we have all scans done at a minimum of 350dpi (they actual prefer 400dpi), regardless of desired line-screen. They have stated that the quality will be the same regardless. The reason they suggest the uniformed scanning is for enlargement if we re-issue the book at a larger trim (which we often do).

I have no problem going to a higher resolution, but my question is will there really be no difference in quality if something output at, say, 175lpi has a resolution of 300dpi versus 350dpi? If there is no difference than why was the original notion of 2x the line-screen developed. Was it just to keep file size and rips times down?

Thanks in advance.

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