Resolusion difference between your jpeg screen shot and "new" image
caused your experience. Your image was saved with 300dpi. But when
you start with "new", the resolusion may be 72dpi by default. In
the text font dialog, the text is rendered with 100dpi or 72 dpi.
Anyway, the text is rendered in 14pt with the resolution of image.
So pixel size was different as you seen.
SHIRASAKI Yasuhiro : Experimental Particle Physics, JLC Team
Graduate School of Science, TOHOKU University 980-8578 Japan.