Get converted normalmap texture?

I have a grey texture that I set to ‘convert to normal map’ in texture import settings.

I want to get that ‘normalized’ texture and encode it to PNG.

When I get the image via EncodeToPNG, it gives me the original gray image. Can I get the converted image somehow?

Try duplicating the texture and setting the new texture type to normal map. Or, you could try bitmap to material lite (free).