Question Is it possible to increase resolution in an existing image?

[Ensign Scrulu]

Hi. opening.download is a site that says in its blurb: 'In addition to increasing or decreasing the resolution of images, drawings, pictures, there are other possibilities . . .'

Howzat?! To me it seems im-effing-possible to increase resolution in an existing image. How can you create something out of nothing? Interpolation? That's fakery to me.

Thank you.

 

[Aeacus]

Howzat?! To me it seems im-effing-possible to increase resolution in an existing image. How can you create something out of nothing? Interpolation? That's fakery to me.

Increasing image resolution is easy, but it will reduce image quality. The bigger the gap between source and target resolution when upscaling - the more loss of a quality there will be.

 

[ubuysa]

When you increase image resolution you have to add pixels, which means you're adding pixels that weren't in the original image. The software used will estimate the colour and brightness of added pixels by referring to the pixels around, but that's not new information, so your higher resolution image doesn't contain any extra detail, just more pixels.