color grading din color correction primary correction secondary correction power window qualifier 1d lut
ACEScct extends ACEScc with a 'toe' region in shadows for more natural grading behavior in dark image areas.
Definition
ACEScct (ACES Color Correction with Toe) is an evolution of ACEScc that adds a "toe" – a gentle curve in the shadows. This prevents harsh clipping of very dark values and allows for more natural grading, especially with high-contrast images.
The "Toe" Difference
Shadow Curve Behavior:
ACEScc: | ACEScct:
|
____/ ____/
| /
| /
| ( ← Toe: gentle transition
_______| ____/Advantages over ACEScc
- Shadow Behavior: No harsh clipping boundaries
- Lift Adjustments: Respond more naturally
- Low-Key Looks: More easily achievable
- Compatibility: Familiar with Cineon/DPX workflows
Practical Application
DaVinci Resolve Setup
- Project Settings → Color Management
- Color Science: ACEScct
- ACES Version: 1.3 (current)
- ACES Input Transform: Auto-detect or manual
Typical Workflow
- Timeline Space: ACEScct
- Grading: In ACEScct
- Output: Via ODT to target color space
Recommendation
ACEScct is today the recommended standard for color grading in ACES workflows. Most colorists and post-production houses have switched to ACEScct.
See also
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