Re: working with 300 dpi in AE for 2K video project that need to be transfered to FILM

"But a 720x540-pixel document remains a 720x540-pixel document."

well, not exactly. when you look at the IMAGE SIZE menu panel (commmand/option/i) in photoshop it uses the terminology DOCUMENT SIZE to describe the dimensions AND the resolution. a picture from photoshop with a DOCUMENT SIZE of 720x540/300ppi displays 4 times bigger in AFX than one that has a document size of 720x540/72ppi, right?

it doesn't matter if you look at it in inches, centimeters, points or pixels. perhaps just a question of different terminology. seems like the important reference is what photoshop refers to as the PIXEL DIMENSION, which is the actual pixel size and takes into account the ppi setting in the pshop document size panel and is the actual displayed size of the image in AFX.