Stop Banding After You Grade AI Skies
Generated skies posterize under contrast. Use a 10-bit intermediate, dither, and a stills-plus-motion checklist before you add grain or reroll.
Generated skies posterize under contrast. Use a 10-bit intermediate, dither, and a stills-plus-motion checklist before you add grain or reroll.
RGB and composite illegal values still fail cable and FAST QC. A Rec.709 16–235 checklist, a legalizer after the grade, and a stills compare to keep the look.
A CDL-plus-LUT recipe so mixed-model shots sit on one timeline, a stills chart to test it, and the rule for when to regenerate instead.
A 30-second false-color pass that flags clipped highlights and muddy faces before any LUT, with the IRE bands to watch on generated skin and chrome.
Generated clips arrive display-referred. Read Rec.709 waveform, RGB parade and vectorscope, then grade exposure, balance, sat, look.
Grade Rec.2020 PQ or HLG once, roll off highlights, and QC two stills of the same frame so the SDR YouTube downmap does not crush the HDR master.
Park on the splice and match black point, grain size, sharpening, and cadence so a generated insert stops announcing itself next to live action.
Models often write full-range RGB into Rec.709 tags. Legalize after the grade, never before, and confirm 16-235 on a waveform before delivery.
Generated faces sit off the skin-tone line. Read the vectorscope, then use hue and sat moves to unify a sequence without running a beauty pass.
8-bit timelines stripe skies after a mild S-curve. Make 10-bit 4:2:2 the house intermediate, and keep stills that prove the banding was the file.
A look LUT on unnormalised clips keeps the mismatch and tints it. Neutralise each shot, match to a master, then grade for style.
Mixed edits break on grain, grade, focal length and motion blur. The order to fix them in, and the one thing you cannot repair in post.
Each video model picks its own white balance and skin rendering. Normalise every clip against scopes before you grade, or mixed-model cuts will jump.
Going straight to 4K amplifies artifacts you could have removed cheaply. The pass order that works, and what each pass can and cannot fix.
A color grade redistributes existing pixel values — it fixes cast and continuity, not content errors, and can surface banding in compressed AI clips.