Image scaling (upscaling) refers to the resizing of a digital image.
When upscaling a photo, more pixels must be generated.
There are different ways software tries to do this.
Based on this tutorial, I downloaded the Upscayl app which is FREE and offline.
Click PLAY or watch it on YouTube.
When it works, results can be amazing.
For me it certainly hasn’t worked, at times. A very bad photo is hard to improve.
Here is one of my 4K iPhone photos compressed smaller by Instagram. It looks fine on a phone, but terrible if you zoom in on a good monitor.
Check the same photo upscaled to 16,128 x 9,072 pixels on Flickr Pro.
Zoom in.
This is ONE of the many reasons I store my original photos on Flickr Pro, not one of the free social media sharing sites. They all compress.
Rick McCharles 