When rendering in 3ds Max 2025 with Corona Renderer or V-RAY Renderer using the ACES (Academy Color Encoding System) color space, the best file format depends on your workflow needs. Here are the recommended options and why:
Best File Formats for ACES Workflow in Corona:
EXR (OpenEXR, 32-bit Half or Float) – Best Choice
Why?
Supports high dynamic range (HDR) and linear color data, which is essential for ACES.
Retains all lighting and color information without clipping.
Supports multiple render passes (AOVs) in a single file.
Works well with post-processing in software like Nuke, DaVinci Resolve, or Photoshop (with plugins).
ACES is natively a linear workflow, and EXR preserves this correctly.
TIFF (32-bit Float) – Good Alternative
Why?
Also supports HDR and linear data.
Works well for single-layer renders if EXR isn't needed.
Compatible with most image editors.
PNG/JPG (8-bit) – Avoid for ACES
Why?
Lossy compression and limited dynamic range (8-bit) can degrade ACES color accuracy.
Only suitable for quick previews, not final renders.
Corona-Specific Settings for ACES:
In Corona Frame Buffer (VFB):
Enable ACES Output Transform (under Color Management settings).
Set Input Color Space to ACEScg (the default for CG workflows).
When saving EXRs:
Use "Half Float (16-bit)" for a good balance of quality and file size.
Enable "ZIP compression" (lossless) to reduce file size.
Post-Processing Considerations:
If compositing in After Effects, Nuke, or DaVinci Resolve, use EXR with ACEScg.
If working in Photoshop, use the ACES 1.2 LUT or an EXR plugin (like OpenEXR).
Final Recommendation:
✅ Use EXR (32-bit Half Float) for best quality and flexibility in an ACES workflow.
✅ Use TIFF (32-bit) if EXR isn’t supported in your pipeline.
❌ Avoid 8-bit formats (JPG/PNG) for final renders in ACES.
This setup ensures you maintain accurate color, dynamic range, and flexibility in post-production. Let me know if you need help configuring Corona for ACES! 🚀