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File > Scripts > Load Files Into Stack might be a start.
Then you could try Edit > Auto-Align Layers.
OK that works. have you any idea if I could nominate 1 point or group of pixels that I could register all the images to? (a contant in all the frames)
I’m afraid I may not understand fully – maybe you could explain more thoroughly what you are willing to do and what you want to have performed automatically?
There might be workarounds (maybe via Scripting).
The Load Files into Stack script offers an "[ ] Attempt to Automatically Align Source Images" option.
However, the automatic alignment algorithms cannot be influenced to consider only certain points in the image, so if the images have different backgrounds (as it sounds like yours do) then it's likely you'll have to hand align them.
One method, if you're willing to spend a little elbow grease, is to make each layer partially transparent then move it around (and/or Transform it to effect size or rotation changes) to align with a key layer underneath.
Hi Noel & C
I am working with some 3D photography formats which require filming while walking in crab like direction (tracking, I suppose) I need to make one part of the image a constant. I have tried it by hand and it takes quite a while and think it could be done automatically after I nominate an area. when making the 3d image the contant point will appear to be on the image plane rather than behind or in front if you understand what I mean?