Cropping 4k for for a 3-screen video

[Per ARgentine]

Hi all,

I'm using the latest build of Redcine-X from the website both mac and windows. I'm working on a 3-screen video which will be output to 3 720p monitors. So I'd like to crop my Red footage to create 3 720p shots that when put side by side form a complete image (minus the top and bottom of the RED original which will be cropped out because of the wide aspect ratio). However I can't seem to understand how the crop tool works because it doesn't give you a preview of the crop. Where is the x/y origin? Is 0 the center of the image or bottom left? I've tried different numbers and seem to get different results than what I expect. Perhaps someone can give me the numbers that I should be plugging in. Any help is appreciated...

 

[Radim Schreiber]

It works in the original resolution (4k). 0 is top left if I am not mistaken.
Cropping is not accelerated using RED rocket and will crash after 1/2 hour using Rocket Cine X.

 

[Uli Plank]

Better use AE CS5.