How to remove pixelization enlarging small image?

[Acorn]

There is a proprietary format called Deja Vu that uses affine transforms (maths) to encode images. It is the closest thing to curved edges and not pixelation you will find. There used to be a free editor available.

Use some of the on-line searches for images and you may find a larger version.

What resolution is the image and what is your desktop resolution?

Acorn

[handrawn]

DJV[U] files...? that's a format for mixed content, so in that sense similar to PDF, possibly epub formats too...