This is a sort of guide on canvas sizes, inches, dpi and pixel x pixels.
when it came to canvas sizes, I always kind of assumed that inches belonged with dpi and pixels were just pixels and that everyone knew that; but i read a whole bunch of comments on a tumblr blog where someone asked about canvas sizes, and SO MANY people were replying with things such as, "4000x4000 px at 300 dpi" or "2000x2000 px at 200dpi".
and I guess not everyone quite understands what dpi's really used for xD.
DPI = Dots per Inch. It means how many dots will be printed per inch.
DPI is actually used for printing purposes. It shows the printer how much pixels to print per inch, literally. A common printer (at home or even at a lot of printing stores) at best prints at 150dpi most of the time actually; there are some super duper great printers that can print REALLY fine that can go up to ...apparently a lot more xD; #dpi, so that's why everyone usually suggests saving your project at 300dpi; most printers are f