Pixel Perfect Alignment

[Alun]

I have a JPEG taken on a tripod at 1280px x 888px. I have taken some video at 1280px x 720px and taken this into Photoshop as layers. I want to align the still image with the video layer and then crop so they are all the same size (eg 1280px x 720px)

How best to achieve this so that they start overlayed at exactly the same position relative to each other?

Thanks in advance

 

[Steve]

Set the layer to Difference on the still.

The image should get darker and darker as you get closer.
Dead black means they're perfectly aligned pixel for pixel.

 

[Alun]

Thats brilliant Steve - works a treat!

 

[Steve]

Excellent.

 

[hawkeye]

Good call Steve... it's also useful if you need to scan something oversized and then assemble the pieces.