Any way to change image size keeping the animation ?

[binouze]

Hi, I have an animation that is too small, the image is 500x500 and as we now need to use this animation in full screen, I tried to double the size of the image and increase the pixel per unit but the rigging is now broken and too small for the new image. Is there any (simple) way to adapt the rig on the new image size other than redo all the rig ?