[EMAIL PROTECTED] (2002-04-12 at 0919.27 -0500): > > Can anyone tell me the difference between dpi, ppi and > > lpi ? If my intention is to print a picture measuring > > 8"x10", at what resolution should I scan ? > dpi = dots per inch
This causes confusion, some file formats say DPI, and monitors too... but IMHO they should say PPI. Dots per inch, but what kind of dots? Multilevel ones like pixels? Single level like ink jets? Single level but mix capable like dye based printers (so multilevel)? > ppi = pixels per inch What monitors and files have. > lpi = lines per inch Or how many different lines of a set of shades you can have per inch with a halftoning printer (newspapers, laser printers, normal ink jets). The more shades (b&w, 16 grays...) you want the less lines you can paint (the less fine the detail is), but more intensity levels avaliable (always supposing same printer). > to know the minimum you need to scan you'll need to know what sort of dpi > your printer is capable of printing. ... > 8000 x 10,000 pixels! Umm, eeeeeek! The guys I know work at 300-400 DPI and A4 (210 * 297 mm) output, that gives around 3300 * 4700 pixels, less than 8000 * 10000. And they do not use home printers, but professional machines with good inks and papers. For home ones I guess 200-300 is more than enough, and that means 2400 * 3300 for a full 8*10, so check what size the original is, and scan so you get that many pixels. > Pretty easy eh? It is not. You will always find problems, due inexperience, not fixed definitions or whatever. Some references are http://www.aim-dtp.net/ and http://desktoppub.about.com/library/weekly/aa101800a.htm, in this last one they already say that terms are mixed, and they add SPI (samples, about scanners, normally called DPI or PPI, being PPI the most near, cos a "pixel is sample", IMO). OK, I think I made it even more confusing now. :] GSR _______________________________________________ Gimp-user mailing list [EMAIL PROTECTED] http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
