When a 'Small' Note Derails Your Workflow

I recently had a client ask for a very specific, seemingly minor, grade adjustment across an entire project: 'make the blacks a little richer, but don't touch anything else.' My initial thought was a quick lift on the master shadow wheel or a slight tweak in the log wheels. What transpired was a rabbit hole of balancing acts that ate up half my day.

I started with a simple contrast curve adjustment, pulling down the shadows. This immediately crushed detail and shifted some of the mid-tone colors. Then I tried Luma Corrector with a custom curve, isolating just the very bottom of the luma range. Better, but it felt artificial in certain shots. The 'magic' happened when I moved to a custom-shaped Power Window on the darkest areas of each shot, inverting it, and then applying a very subtle negative offset to the Luma channel, followed by a slight positive saturation bump in the same range. This preserved highlights and midtones while deepening the shadows without crushing them completely.

The 'don't touch anything else' part was the killer. It highlighted how interconnected every aspect of a grade is. What's your go-to technique for making isolated, subtle changes to one part of the tonal range without affecting the others and still keeping clients happy?