On Friday 08 April 2005 05:24 pm, Ken Herron kherron+lugod-at-fmailbox.com |lugod| wrote: > Henry House wrote: > > One of the more common operations that I need to do with JPEG images is > > to change their print resolution so that when printed (e.g., as included > > figures in a LaTeX document) they print at 300 dpi (for example) instead > > of 72 dpi. > > To start with, DPI (dots per inch) implies that each pixel has a > physical size, 1/72 of an inch or whatever. As far as I know, JPEG > images have a size in pixels (e.g. 106 by 64 pixels for the watertower > image on the LUGOD home page), but the pixels have no inherent physical > size. Something outside of the image--probably the software used to > embed the image into the document--is deciding how large the image > should appear on the page. I would expect that you can adjust that, ie > tell the software how large to print the image or what DPI to use.
JPEG files include DPI as metadata, which is used by some programs. I suspect it would be fairly trivial to write a program that changes this. -- Ryan Castellucci - http://ryanc.org/ GPG Key: http://ryanc.org/files/publickey.asc _______________________________________________ vox-tech mailing list [email protected] http://lists.lugod.org/mailman/listinfo/vox-tech
