> -----Original Message----- > From: Marcus Bowman [mailto:marcus.bow...@visible.eclipse.co.uk] > Sent: Tuesday, May 16, 2017 3:46 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] new thread inspired by Christophers question about > 3d printer sliceing SW. > > > On 16 May 2017, at 20:18, Chris Albertson wrote: > > > I think using a screen only works on small size printers. Bigger screens > > lack resolution. The phones and tablets have about 300 pixels per inch. > > > > > > Look at monitors. The new "standard" is 4K. If it is 20" across that is > > 4000/20 pixels per inch or 200 pixels per inch. Not as good as an Apple > > iPhone that has about 300 per inch. Then as monitors get bigger they > > still have the same 4K pixels. > > Interesting how 'standards' develop, I work with two Apple Cinema displays > which must be 15 years old. Both have 4K pixels. So the new 'standard' is > actually very old indeed. > That suggests that an effective 'standard' might be a fixed pixel density of, say, > 300 pixels per square inch (same as a good quality printed image) but the > larger the screen area the more the absolute number of pixels, to maintain the > overall resolution. > That would make sense for an application like 3D printing, where the > resolution should stay the same no matter the size. > > Gene might correct me, but I reckon the number of pixels and the overall size > of the screen is a bit of a smokescreen. You need to push a larger screen > further away from you to view it properly, so the effective resolution is not the > number of pixels, but the number of pixels at a particular distance. > Again, not useful when applied to 3D printing, unless you want to make the > surface of the object appear smoother than it really is. > > Marcus >
In the interests of accuracy: "...an effective 'standard' might be a fixed pixel density of, say, 300 pixels per square inch (same as a good quality printed image)" I think that you meant 300 pixels per inch or 90,000 pixels per square inch. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
