Good luck printing anything at 870dpi. This whole article is a bit confused. Image quality isn’t about the ability to discern detail. Many people cannot see th

Good luck printing anything at 870dpi. This whole article is a bit confused. Image quality isn’t about the ability to discern detail. Many people cannot see the detail in their 4k TVs or a photo, it’s about not seeing visible pixelation. Those aren’t the same thing. Visible pixelation is connected to contrast and color depth. That’s why a perfectly smooth gradient appears as bands of color in poorly encoded images and video. There’s no detail in gradients at all. The pixelation is due to a lack of color information. On top of that printers use different numbers of colors (from 3 to 11 or more) and different ways of sizing and layering dots (if you aren’t using continuous tone printers which are very rare nowadays). Then you have to add in the ability to up res images plausibly using modern algorithms. Whereas before we were always stretching the data we had, now by adding false detail using ML we can scale a significant amount without a visible reduction in quality. That can be very effective at removing pixelation while preserving the original image content. So in reality there aren’t hard and fast rules. It’s totally image and output dependent.