536873c58e
When a test fails and it produces a difference image, also compute the min/max per-channel signed difference statistics. These numbers can be used to adjust the fuzz needed for fuzzy_match_pixels() to pass. Otherwise one would have to manually inspect the reference and result images and figure out the values. Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>