Canon 6D, Canon EF 16-35 f/2.8 L III; Sigma 35mm f/1.4 "Art"; Canon EF 70-200 f/2.8L IS II, Canon EF 100mm f/2.8 L IS Macro; Canon 24-105 f/4 L ; Canon EF-S 17-55 f/2.8 IS (unused nowadays), EF 85 f/1.8; Canon 1.4x TC Mk. 3; 3x Phottix Mitros+ flashes
Yes, it was calibrated, but the Walgreen's photos were just like yours: dark, unacceptable. And, that was with me standing in front of the lab guy, telling him to shut off the auto correct. Maybe it's as Sean says, and they aren't trained on how to use it. Don't know if that's what happened in my case, but they have been consistently bad from Walgreen's. Walmart was better, but still too dark.