> Posted by Michael Hahn on Friday, February 21, 2003 - 6:25 pm: <font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">•<font color="ff0000">• DPI for inkjet output can be between 180 and 240 for MOST modern > printers. You have to consider the distance from the image for > viewing. I used to use 300 dpi, but learned that taking to 240 would > give me the same or better output. I have read that 300 dpi can even > degrade the image. There is a formula ... and it depends on the > printer ... and I will find it and post it.
Michael,
You are confusing DPI and PPI. Inkjet printers print dots, hence DPI...but when you send data to the printer, you send PIXELS, not dots, so your 180-240 is PPI, not DPI. The printer driver turns the pixels into dots by a process called "dithering". It takes more dots to produce a pixel, which is why you send less Pixels to get more Dots. Typically, you'll get better output, at least for Epson inkjet printers, by sending more PPI, up to 360 is the limit. What I suggest is people not res&le the image when resizing it, just let the PPI fall where it does (even if it's some odd number like 341.2) and let the printer driver dither the higher PPI, and my experience shows this gives better results than res&ling the image in PS.
Regards,
Austin