Hi Roger,
Maxim DL contains probably the best blink comparison tool I have seen. I believe CCD Soft can also blink images. The Maxim Supernova blink programme aligns a reference (say your own or a DSS image) image with your current image, you can set the blink rate but you still need your eyes to note any changes. It really is very simple to use and quite effective (Stu Parker has found 11 this way) but is laborious if you have hundreds of images.
We have looked into image subtraction software but I think this is difficult to find at the amateur level.
PeterM.
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