QUOTE(uareader @ Mar 4 2016, 11:57)

I don't get that "x" part.
Normally would expect "p" for pixels, or expect a % or ratio or something, but I don't see how you're supposed to understand that value followed by a "x".
While the "p" in resolutions is often interpreted as vertical resolution/scanlines, it actually means [
en.wikipedia.org]
"progressive". However, we base resamples on horizontal resolution/screen width. It's common to denote image resolutions as, for example, 780x1000 - 780x just cuts off the vertical part.