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Hi there!
According to the headers of /camera/depth/image:
$ rostopic echo -n 1 /camera/depth/image | head
header:
seq: 304
stamp:
secs: 1406254046
nsecs: 731604330
frame_id: /camera_depth_optical_frame
height: 480
width: 640
encoding: 32FC1
is_bigendian: 0
and the headers of /camera/depth_registered/image_raw:
$ rostopic echo -n 1 /camera/depth_registered/image_raw | head
header:
seq: 0
stamp:
secs: 1406254097
nsecs: 573718779
frame_id: /camera_depth_optical_frame
height: 480
width: 640
encoding: 32FC1
is_bigendian: 0
They both are the same size: width, height and encoding are the same.