KiloClawPowered by OpenClaw
Back to Cookbook

Gamma Shift QC Pack

Detect and manage the QuickTime/Rec.709 display shift before delivery

Exports look different between your timeline, QuickTime, browsers, and YouTube — washed out or too dark — causing wasted time and client confusion. This recipe adds a standardized metadata inspection and verification step so you can tell whether it's a real file problem or just a player interpretation difference.

House RecipeCreative9 min setup
Try in KiloClawFree 7-day trial

INGREDIENTS

🔔Notifications✉️Email

PROMPT

Create a skill called "Gamma Shift QC Pack". Inputs: - export_watch_path - sample_timestamps - generate_control_clip_seconds (optional) Behavior: - When a new export appears, run ffprobe color tag inspection. - Output a QC pack folder with stills and a short control clip (optional). - Send me a checklist explaining how to validate by re-importing into the editor and cross-checking in at least two playback contexts.

How It Works

This skill inspects your export's color metadata with ffprobe, generates a QC pack with

still frames and an optional control clip, and gives you a checklist for validating

appearance across multiple playback contexts.

What You Get

  • Color metadata inspection: color primaries, transfer characteristics, colorspace
  • QC pack folder with still frames at key timestamps
  • Optional short control clip (e.g., 10 seconds) for quick comparison
  • Player sanity checklist: compare in at least two players (QuickTime vs VLC, browser, editor)
  • Re-import instruction: bring the export back into your timeline and compare scopes

Setup Steps

  1. Point to your export watch folder
  2. Set sample timestamps for still frame extraction (e.g., 00:00:05, 00:02:10, 00:10:00)
  3. Optionally enable control clip generation (default: 10 seconds)
  4. Run on every final export or as a manual pre-delivery command

Tips

  • The QuickTime gamma shift is a display issue, not a file issue — knowing that saves hours of re-grading
  • Always check in at least two players before concluding the file is wrong
  • Rec.709 tagging issues are most visible in highlights and skin tones — pick sample timestamps accordingly
  • Pair with Proxy-to-Original Integrity Check for a complete pre-delivery QC pipeline
Tags:#color#gamma-shift#rec709#qc

Related Recipes

Proxy-to-Original Integrity Check

A pre-export gate that prevents accidentally delivering proxies

You finish a cut in proxy mode and later discover the export or grading pass used proxy media instead of originals. Quality loss, wrong color decisions, and a wasted delivery. This recipe adds a repeatable pre-export check so you never ship from the wrong media tier.

Creative8 min setup

VFR Gatekeeper

Stop audio drift by quarantining variable-frame-rate clips at ingest

Audio slowly drifts out of sync or randomly desyncs in your timeline when footage is variable frame rate — common with iPhone footage, screen recordings, and some OBS workflows. This recipe catches VFR clips at ingest, transcodes them to constant frame rate, and quarantines the originals so drift never reaches your edit.

Creative15 min setup

RNA Integrity Rescue & RNase-Control Workflow

Prevent and diagnose degraded RNA before it ruins downstream assays.

Improve RNA yield and integrity by enforcing RNase-free technique, stabilizing samples, and isolating the exact step where degradation is introduced.

Work20 min

NanoDrop vs Qubit Reconciliation

Interpret concentration disagreements without guessing.

Resolve DNA/RNA quant discrepancies by distinguishing "what absorbs at 260 nm" from "what the dye binds," and by using purity metrics as decision inputs.

Work10 min