Gerald Undone Curve vs. Reducing ISO In Post

Online tutorials insist on making an S-curve, but the correct way to normalize ETTR footage is to create a gentle convex curve. It’s also possible to reduce ISO in post. Which method is better? The clip normalized with a curve (on the right), is less saturated and has greater highlight detail. The clip on the left, like the one to the right, was recorded at ISO 800, but was reduced to ISO 160 in post. Of course, contrast, exposure, highlight roll off and saturation will all depend on how you make the curve. We’re not sure we don’t prefer the curve to changing ISO, but the latter is unquestionably easier, especially if you’ve got a lot of clips.