On Tue, Dec 02, 2008 at 02:36:42PM +0000, Barak A. Pearlmutter wrote: > For reading on a handheld ebook reader, I'd say 100dpi is about right.
depends on original, you may want/need to zoom in looking at original data, not interpolated one. > For printing, I dunno. ... > Perhaps there should be no default at all, and an explicit resolution > should always be required? I think resonable defaults must be set, else many user scripts/apps may break. That's like many PS utils. The 300 dpi default is the right choice, since it's the well established default everywhere in PS/PDF areas - ie document processing systems. It's been choosen for quite good reasons: (perfect) human eye can resolve 2 dots ~0.1 mm apart @ 1m away, that's roughly the min angular separation of 2 dots @ 300dpi @ ~0.8m away - ie length of ~straight arms, the ~max reading distance for newspapers and the like. Over 50% of people have sight defect, most are short-sighted, hence for the vastly prevalent task of reading material on A4/Letter paper, more than 300dpi is nearly pointless (ie marketing pitch). You want and need more true (color) dpi on special stuff, provided of course you're not already starting from low res. material, and since you're using a compression technology, you're better off making tests for the optimal dpi wrt your requirements anyway, regardless of any default. (iirc I'm afraid some gs/PS/PDF pkg once set default to 600 dpi already, on same arguments as orig. reporter; dunno if it's been reverted since then) > My inclination is to simply follow whatever upstream does. in which case we'll bug upstream, should they choose to change thoughtlessly. thanx -- paolo GPG/PGP id:0x3A47DE45 - B5F9 AAA0 44BD 2B63 81E0 971F C6C0 0B87 3A47 DE45 - 9/11: the outrageous deception & coverup: http://journalof911studies.com - -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
