I’ve been wondering about a color checker, too. I’ve gotten a new camera (Canon 5DS R) and I feel like I’m missing a setting somewhere. It seems like an exposure issue, because everything seems a little dark. Here’s an example of a photo back as it looks unedited, then how it looks after just applying the basic “Auto” preset. The latter is what it looks like to me in real life.
I’ve been going through all the camera settings, info on the Canon site, revisiting Adam’s class and Peter’s book, and it seems like maybe I need to adjust a setting in the camera and/or create a camera profile using a color checker. Do you all have any thoughts?