Archived posting to the Leica Users Group, 2004/11/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Frank, Tarek, et.al. If I can interject, regarding PPI for printing, it is my understanding that the native printing resolution for the Epson printer family is 360 Dots per inch, and for the canon, HP and others it is 300 DPI. I believe this can be checked in the owners manual. What this means is that if your Photoshop image is sized to some dimension, say 8x10, but the resolution is 450 DPI, the Epson software will do a data interpolation to add or remove dots, as it deems appropriate. Certain factors or multiples seem to be okay, ie. 240 DPI, 180, etc, and 200, 300, or the other guys printers. Do you want Epson software manipulating your images? I'd prefer to do it in PS and call it done. What I do as general practice is scan at highest resolution, do all work in 16 bit flow, then resize as 11x14 at 360 DPI, or 8x10 at 360 DPI, etc., and save these files as ready for print files: multiple presized and preset files so that I can print on demand the appropriate number and size prints from an already prepared image. The printer set up page is set to 1440 DPI for the finest printing it can do, but I think if you take any standard print you really like, and then print it at 180, 240, 360, 480, etc. you'll see for yourself that the 360 file size (for Epson) is as good as it gets. By the way, this also implies that using Unsharp mask at radius 1.8 or less (DPI/200) keeps the edge effects below the perception threshold for viewing. Usually 1 % of the granularity falls below the perception level, using 1/2 % guarantees it. Hope this helps. Norm