How can I increase the resolution of a text in a PNG file?
Solution 1:
The short answer is, you cant.
PNG is a raster graphics format, while (in your example) the PDF is a vector graphics format. Raster images have a fixed resolution. If you scale them up or down, they will lose quality. If you want an image that can be scaled bigger or smaller, without loss of quality, it has to be done in a vector format.