Hmm. Thanks for your suggestion Bird_FAT, but I have looked at that already, and it does not seem entirely significant, as the same sort of results occur if one repeats the entire process using an original image created with a different dpi.

I agree, one can change the size using properties, but it's an enormous waste of time if one is importing say 20 images all of identical pixel size, and then have to go through each one fiddling about with the sizes until they all match up again. In my book, it ought to work first time every time.

R.