Unlike “Star Trek”, we do not yet have that magical “magnify and enhance” technology that lets the viewscreen pick up a tiny four-pixel grey blotch on the screen and somehow turn it into a slightly-blurry but still fully-detailed Klingon cruiser, or whatever. Once an image has been created, it is as detailed and as high-resolution as it can be. You cannot actually increase the resolution of an existing image file in Paint.NET (or in any other image editing program). Images that are displayed on a screen are generally presented at their native size that 800 x 1100 pixel image will take up 800 x 1100 pixels on the screen (or will only partially display if that’s bigger than the screen in one dimension or more). DPI refers to a physical printout of an image if your image is 800 pixels by 1100 pixels and is scaled at 100 DPI, then printing the image out will result in an 8″x11″ printout. When we talk about image resolution, we usually express it in terms of dots per inch (DPI).
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