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Use -resize rather than -geometry.
Ok, try this:
- composite -gravity southeast -dissolve 70% tag_image.tif \( input.jpg -resize 635 \) output.jpg
Under Windows you won't need the backslashes. Previously the command lines were ambiguous. With the parenthesis it makes it clear we only want to resize input.jpg.
For a more detailed information on this see, IM Examples Basics
http://www.cit.gu.edu.au/~anthony/graph ... #image_seq
Actually read the whole page, for a overview.