Best ImageMagick parameters for rescaling images with text

One of my ebooks contains many .png images of Arabic text that was saved with a relatively small font size (most likely 11 or 12pt), which makes it really hard to read. (For an example, see the attached file.)

I wondering if there are any ImageMagick* parameters that do the following:

1. Enlarge the picture by about 25-50%.
2. Smooth the resulting image.

Basically, I'm looking for any parameters that'll make the image slightly larger and more readable.

*It doesn't have to be ImageMagick; any suitable tool that supports batch processing is fine.

Attached Images