Seems to me, though I haven't done it personally, that there's a stacking mode in Photoshop Extended that allows you to remove the stuff that changes and keep the stuff that doesn't change. Now, if your time lapse shot covers too broad a range of time it might be that things like shadows will change too much to use that.
Look here for more info on how to stack multiple shots in Photoshop:
Noel Carboni wrote:
Seems to me, though I haven't done it personally, that there's a stacking mode in Photoshop Extended that allows you to remove the stuff that changes and keep the stuff that doesn't change.
Thanks, Noel! I tried this out but there's too many cars on the road at any given time, so I just end up with ghosted images everywhere.
Maybe the right path is to start with the main background image, remove the lock so it's editable, then just add additional photos as layers over and over til I get a clean composite.
So the easiest way to do this seems to be the following:
- Open a small stack of related photos into the same Photoshop file (I used Bridge, Tools - Load Files into Photoshop Layers)
- Select a layer that has eraseable areas (layer "B"), and move it just below the layer you want as your background plate (layer "A").
- Select the background plate layer A, and choose Add Layer Mask.
- Choose the Eraser tool and erase from background plate layer A. Use Layer B in Photoshop or Bridge as a guide for where to erase.
- Once all erasable areas are done, select Layers A & B and Merge Layers.
- Continue on with steps 2-5 over and over until the plate is completely clean of cars, people etc.