HDR vs. SDR: How a Finishing Studio Grades for Both

Most streaming platforms and many broadcast outlets now ask for a project to be delivered in both HDR and SDR — High Dynamic Range and Standard Dynamic Range. It sounds like a simple export setting, but treating it that way is one of the more common ways a finished image ends up looking wrong on half the screens it plays on. Understanding what actually changes between the two, and how a finishing studio handles the difference, matters for anyone planning a delivery schedule.

What's Actually Different Between HDR and SDR?

SDR is the dynamic range television and film have used for decades — a defined, comparatively narrow range between the darkest black and brightest white a display can show. HDR expands that range significantly, allowing far brighter highlights and deeper, more detailed shadows to exist in the same frame, closer to what the human eye actually perceives. A sunset that looks pleasant but capped in SDR can have real, searing brightness in HDR, and a shadowed doorway that goes flat black in SDR can retain visible detail in HDR. That expanded range changes how a colorist has to think about contrast, not just how bright the image can technically go.

Why Can't You Just Convert an HDR Grade Down to SDR Automatically?

Automated tone-mapping tools exist to convert an HDR master into an SDR version, and they've improved a great deal, but they don't understand creative intent. A highlight that was meant to glow softly in HDR might compress into a harsh, blown-out patch in an auto-converted SDR pass, or a shadow that reads as moody and rich in HDR can crush into featureless black once mapped down. A finishing studio treats the SDR version as its own pass requiring a trained eye, using automated tone-mapping as a starting point rather than a finished deliverable, then adjusting shot by shot where the conversion doesn't hold up.

Does Grading Order Matter — HDR First or SDR First?

Most finishing studios grade the HDR master first, since it's easier to pull detail and contrast down into SDR's narrower range than to try to invent highlight and shadow detail that was never graded into an SDR-first pass. This connects closely to the underlying camera data feeding the grade, discussed in log footage versus Rec.709 grading — working from log or raw camera originals with their full dynamic range intact is what makes a strong HDR grade possible in the first place, which then flows down cleanly into SDR.

What Do Streaming Platforms Actually Require?

Delivery specs vary by platform and continue to change, but most major streamers now request both an HDR master (commonly Dolby Vision or HDR10) and a separate SDR trim pass, each meeting specific technical thresholds for peak brightness, color space, and metadata. This is closely related to the broader technical requirements covered in the streaming platform color grading deliverable specs guide — dynamic range is one piece of a larger checklist that includes color space, bit depth, and file wrapper requirements a studio has to confirm before final delivery.

What Goes Wrong When HDR/SDR Isn't Planned For Early?

The most common problem is schedule, not technique: productions that don't budget time for a proper SDR trim pass end up relying entirely on automatic conversion, and the results show it — flat highlights, crushed shadows, or skin tones that shift unexpectedly between versions. The fix isn't complicated, but it does require building the extra pass into the finishing timeline from the start rather than treating it as an afterthought once the HDR grade is approved.

What Should Productions Ask About Before Finishing Begins?

Confirm which platforms the project is delivering to and what dynamic range formats each one requires, ask whether the studio grades a true separate SDR trim pass or relies solely on automated conversion, and build extra time into the schedule specifically for that second pass. Productions that raise these questions during scheduling, rather than during a rejected delivery, move through finishing with far fewer last-minute surprises.

*Coloring Book is a Los Angeles–based color finishing studio founded by cinematographer and colorist Alexander Lakin. Learn more at wearecoloringbook.com.*