Yes 143 ppi can make a nice 20X 30 since your viewing distance is going to be greater than say for a 4/6 in print. And even 100 ppi can give you a nice 4/6. I'm not saying, that you can't set your resolution to 300 or whatever number you wish. I'm saying it is not necessary or logical to do that since the 300 ppi res. recommended for printing is a minimum, not a maximum number.
Last edited by suci; 09-14-2011 at 04:08 PM.
ars longa vita brevis
I have an Epson 4800 Pro (wide format printer) and the recommended PPI is 240. I always change the dpi before I resize for print and I print through Photoshop CS4. I get little or no distortion on the photos whether I resize through CS4 or Perfect Resize v3. I have a Canon 5D MK II and I have printed (outsourced) 20x40 and 30x40 on canvas which look very good.