How / How to enlarge images without losing quality?

Question

Images

Greetings.
Tell us about scripts, programs and services for enlarging images - what is there anyway?

Answer 1

Virtually nothing but the aforementioned Photoshop. Movie "gotcha!" remain kinsh.

Answer 2

There are two interesting options: upscaling using neural networks and the same using cunning algorithms that try to find a variant of the image that could give the original one when reduced.
All these methods obviously lie and are suitable only for artistic purposes, but not for extracting any information from the image.

Answer 3

If we talk about programs, then you can use Photoshop. There, the increase in size is usually done by multiplying the original image by 5-10% with the simultaneous use of the sharpening filter at each iteration. What do you mean by "quality" - this is not known to me, but about 12 years ago I managed to stretch the image one and a half to two and a half times like this. At the same time, it was impossible to distinguish the original from the stretched image on the screen. Today - I don’t follow it on purpose, but I saw something - new algorithms for filtering noise and sharpness have been added to PS. You may get better results.

Answer 4

In fact, your question violates the laws of physics.
By enlarging the image, the quality is lost naturally, and in order to achieve your goal, you need to increase the quality of the original image - which is impossible.
But there is one solution - "Increasing" the quality using photo editors. (Photoshop, etc.)

Answer 5

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