It is really hard to judge from the picture but it could be a Southern swallowtail, Papilio alexanor. The Tiger swallowtail is not found in Europe.
http://www.eurobutterflies.com/species_pages/alexanor.htm
I lightened it and it is a Tiger Swallowtail in our country. You may have a different name. If you know anyone that could help you put on the free program of Irfanview, you could put up pictures that could be seen better.
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