Which image of text is "18point" ?

1. Image of Text

This is 18point image of text (Windows, Photoshop, 72ppi)

This is 18point image of text (Windows, Photoshop, 96ppi)

This is 18 point image of text (Mac, Photoshop, 72ppi)

This is 18 point image of text (Mac, Photoshop, 96dpi)

2. Text

This is 18point text.

This is 1.5em text.