I've been working with multiple exposure images here for a while. Sometimes things get weird. A few fairly straightforward techniques are involved. There are variants of each.
We start with a series of images that have been aligned with one another as layers in Photoshop. Usually, these are auto-aligned. Sometimes that does not work well and I have to do it manually. These images may have been shot from a stationary position, usually hand-held, but often from a moving automobile.
Usually, as in #1, I create a second layer that surrounds each original image layer with a thin yellow line. In Photoshop I merge all these yellow boxes into a single layer that goes above all the original layers. Again as in #1, I select the people (or vehicle, or...) of each original layer and create a new layer on top of all the other layers. If there is any overlap, the yellow lines go behind the subject but are on top of the original layers.
Specific to #1, the background auto-aligned perfectly, but the runners did not. (They were running! Duh!) I left them that way, making certain that I had the sequencing correct. To simulate movement blur, the topmost runner is at 100% opacity, and the rest are at 40% opacity, merged into a single layer on top.
Harry is demanding to for his walk, so I will be editing and adding to this long post when we get back.
