Modern inkjet printers usually use printing resolutions like 2880 dpi which results in printing data of around 800 Megapixels for a A4 print.
sorry but thatÂ´s wrong.
DPI for a printer means DOTS per inch.. a DOT is a INK point from one of the nozzles in the printer head. itÂ´s not a PIXEL. multiple DOTS make one PIXEL.
beside resolution you need more of the INK DOTS if you want better color, because you can mix the color finer with more DOTS.
so you cant compare these two as long as you donÂ´t knwo how many DOTS a printer use to create one Pixel on paper.
I know that and I hoped to make it clear what happens. In fact, modern inkjet printers ARE able to mix colors within a single dot (to a certain amount), and they certainly do not use a fixed number of dots to represent a pixel.
It's rather a inbetween thing, just like a bayer sensor's true resolution ability is higher than a fourth of a foveon sensor with the same amount of pixels.
Like I tried to point out, inkjet printers are indeed able to render sharp edges with full DPI-resolution because they do NOT use fixed half-tone rastering but different kinds of error-diffusion dithering algorithms.
In any case upscaling ALWAYS happens when printing to high-resolution printers.
(this is what I was trying to point out)