Mailing List AE-List@media-motion.tv ? Message #49616
From: David Simons <ae@cosa.com> Subject: Re: [AE] How to identify motion artifacts not present in still? Date: Sat, 15 Jun 2013 00:17:57 -0700 To: After Effects Mail List <AE-List@media-motion.tv> Not sure this will work, but here’s an idea to try: duplicate the layer, shift it in time by 5 or 10 frames, set the anchor point with the pan behind tool to be the center of rotation (near the pole star), set the blend mode to Difference, then rotate the layer until it lines up exactly with the original layer. If the stitching error is local (i.e. the rest of the layout is spatially rigid), you should see just the error and rotated error, as everything else drops to black (modulo the lighting difference due to sunrise). If the stitching error has introduced a global crimp (i.e. part of the image has moved closer/further from the rest of the image), you’ll only be able to make one side or other of the crimp drop to black. But that should also help identify the error on a still frame, as you can see the edge of the black. This whole scheme depends on the stitching result being a uniform projection. It might not be. Good luck! For a moment I thought there could be a role here for the new Warp Stabilizer VFX in AE CC shipping on Monday. It has a reversible stabilization mode. Good for locking down some movement, doing some pixel surgery, and then de-stabilizing again (effectively tracking the surgery into the shot). But in this case, your artifact is already stationary relative to the frame, so locking down the content wouldn’t help. Hmm, except maybe it could repair a global crimp? No, I don’t think so. Just having a nice chat with myself now. -DaveS From: Stephen van Vuuren <stephen@sv2studios.com> Reply-To: After Effects Mail List <AE-List@media-motion.tv> Date: Thu, 13 Jun 2013 11:58:32 -0400 To: After Effects Mail List <AE-List@media-motion.tv> Subject: [AE] How to identify motion artifacts not present in still? I’ve got a sequence of my film that has bedeviled me as well as the software developer of PTGUI (Panoramic stitching software). It’s a 10K timelapse sequence shot over 11 days created from 5 stitched 5D Mark II raw files. The stitching is done in PTGUI, however it appears impossible to fix according three of the best stitchers out there and the software developer. You can see it raw test from 1 day here. It’s really hard to see on web video but watch the upper part of the image and stars blink in and out. It’s a thin line or zone where star positions jump on the bad stitch line from the panoramic warp.   https://vimeo.com/65194332 password is stitch   I need to see if there is better method that trial and error to precisely find the line as you can only see it and therefore mask it while the clip is in motion. I’m not aware of any way in AE to mask a moving clip nor can think of any way to simulate it on a still. As its stars at 10k, I need to be nearly 1 pixel accurate in masking the region to apply the fix (time-remapping layers) to fix this stitch error.   stephen van vuuren 336.202.4777 http://www.insaturnsrings.com/ http://www.sv2dcp.com/ http://www.sv2studios.com/ <http://www.sv2studios.com/> A film is – or should be – more like music than like fiction. It should be a progression of moods and feelings. The theme, what’s behind the emotion, the meaning, all that comes later. –Stanley Kubrick

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