Comparison · Remastering decision
SDR2HDR Conversion vs AI Upscaling
Both tools make old video look better. They work on different axes: upscaling adds pixels, conversion adds dynamic range. The question is never 'which one' — it's 'in what order'.
Core idea
Two axes, not two competitors
Resolution and dynamic range are orthogonal. A 480p SDR video can become 1080p SDR (upscaling) or stay 480p but gain HDR brightness (conversion). Do both and you get a 1080p HDR file — each step operates on a different dimension of quality.
Side by side
| AI upscaling | SDR2HDR conversion | |
|---|---|---|
| Changes | Pixel count (resolution) | Luminance, gamut, bit depth |
| Input | SD/HD video at any range | SDR video at any resolution |
| Output | HD/4K/8K in the same dynamic range | 10-bit HDR10 in the same resolution |
| Best for | Old SD/HD masters that look soft on modern screens | SDR libraries that should shine on HDR displays |
| Failure mode | Invents texture where there is none | Cannot restore clipped highlights |
When to use each one alone
Upscale alone when the destination is SDR: social clips, SDR-only platforms, archival viewing. Convert alone when resolution is fine but the picture is flat: a 1080p SDR master heading to an HDR streaming tier.
The combined remaster pipeline
For a legacy library remaster, the standard order is upscale first, then convert to HDR. Upscaling first gives the HDR model more detail to work with — shadow texture and edge information survive the HDR pass better when they were already reconstructed at higher resolution.
Our recommended pipeline: super-resolution API → SDR2HDR API → deliver HDR10. Both are async jobs, so the two stages chain naturally with webhooks.
Order matters — why
- Upscale first: more source detail for the HDR model
- Convert second: 10-bit HDR10 out of the chain
- Never the reverse: converting first then upscaling doubles the hallucination surface
- Match settings: same library, same presets, per-batch config
FAQ
Common questions
Should I upscale or convert first?
Upscale first, then convert to HDR. The HDR model works from the higher-resolution detail and produces cleaner highlights and shadow texture.
Do I need both?
Only if the target is a big-screen HDR deliverable. For SDR-only platforms, upscaling alone is enough; for HDR at the source resolution, conversion alone.
Does conversion also add resolution?
No. SDR2HDR changes dynamic range and color, not pixel count. Pair it with super-resolution for a full remaster.
Keep exploring
Related guides
SDR2HDR API
Convert SDR video to HDR with restored brightness, gamut and detail.
Learn moreSuper Resolution API
AI upscaling that recovers real detail, not just sharpening.
Learn moreSdr2hdr vs Native HDR
Converted SDR-to-HDR is not native HDR — we explain the honest differences in luminance, color, metadata and gradin...
Read guide