  Fiji is a Java platform widely used by biologists and other experimental
scientists to process digital images. In particular, in our research - made
together with a biologists team; we use Fiji in some pre-processing steps
before undertaking a homological digital processing of images. In a previous
work, we have formalised the correctness of the programs which use homological
techniques to analyse digital images. However, the verification of Fiji's
pre-processing step was missed. In this paper, we present a multi-tool approach
filling this gap, based on the combination of Why/Krakatoa, Coq and ACL2.
