Enlarging a big image (tiff file)

[MrTPenguin]

I have a tiff image of about 3000 x 2300 pixels, 300dpi (20 MB), which I want to increase to roughly 8000 x 6000. Can anyone advise me on the best program(s)/algorithm(s) to accomplish this? I already have an adobe-produced version and the windows 10 MS Paint version, which are almost identical. And these are actually decent quality, so I'm mainly wondering if you can do better.

[XanKriegor]

Let me try with Jasc PaintShop Pro. XnView also can resize with many methods.

[Danger135]

IrfanView. Freeware.  You can use resize or resample (more methods, calculating mid-colors). With resize it will be sharp as blade.

[MrTPenguin]

Thanks guys.

Danger: I've installed IrfanView and will try it.

Xan: How would you like me to send the image to you? You could PM me.