Color management for real

IntermediateDuration ~30 min video + 45 min hands-onTools DaVinci Resolve (free)

Why this lesson

In 2.1 you learned that a color space is a gamut plus a transfer function, and that every camera shoots a log-and-gamut pair you must name. Color management is the system that uses those names to move an image from what the camera saw to what your display can show — automatically, consistently, across a whole timeline of mixed cameras. Level 1 gave you one route (a single CST node). There are actually three, and a working colorist chooses between them per project. This lesson sets up all three so you can pick with intent instead of copying a preset.

Watch

Watch for: Mostyn first proves a CST is mathematically identical to color management — he grabs a still, resets, color-manages the same clip, and split-wipes: identical. Then the standout demo (around 3–6 min): with the CST at the START of the tree he pushes offset hard and the image clips instantly; with the same CST swapped to the END, the same push rolls off cleanly with no clipping. Watch why: at the end, you’re grading in the big DaVinci Wide Gamut space and only funnelling down to Rec.709 last. He closes by building the pro pipeline: input CST → grade → output CST, then applying it across a timeline with groups.

The explainer

Color management always does the same job — map camera space to display space — but exposes it three ways.

Route 1: a manual CST pipeline. You place the Color Space Transform nodes yourself, which means you control where in the tree the conversion happens. Mostyn’s demo is the reason this matters. Put a CST at the very first node and you’ve squeezed the image into Rec.709’s small gamut before you grade — so the moment you push offset, you slam into that boundary and clip. Swap the CST to the end (Cmd-drag to reorder) and you grade underneath it, in the wide working space, funnelling down to Rec.709 only on the way out. Same conversion, but now a hard push rolls off gracefully instead of clipping. The pro shape he lands on: an input CST (camera → DaVinci Wide Gamut) as the first node, your grade in the middle, and an output CST (DaVinci Wide Gamut → Rec.709 / Gamma 2.4) as the last node. He then sets the input CSTs once per camera using group pre-clip nodes — a preview of 2.7.

Route 2: Resolve Color Management (RCM). Instead of placing nodes, you set the project’s color science to DaVinci YRGB Color Managed, choose a timeline color space (the working space, DaVinci Wide Gamut by default) and an output color space (Rec.709 / Gamma 2.4 for SDR), and tag each clip’s input color space to its camera pair. Resolve then handles the conversions invisibly. In the Blackmagic video, Cullen Kelly shows the payoff: on a 200- or 2000-shot timeline, you designate input and output once and the system normalizes everything — no dialling contrast into every clip by hand. This is the modern default and where most projects should start. RCM also exposes an advanced custom preset (input/timeline/output spaces, working luminance) that Kelly rightly says to leave at defaults until you have a specific reason.

Route 3: ACES. The Academy Color Encoding System is a scene-referred, camera-agnostic standard: every source is mapped into a common ACES space by an IDT (input transform), you grade in the ACEScct working space, and one ODT (output transform) maps the result to your target display. Scene-referred means you’re working with the light values as the scene really was, before a display transform squeezes them onto a screen — a concept Level 3 unpacks fully. Kelly’s demo shows ACES and RCM producing subtly different looks from the same clips: neither is “wrong,” they’re two valid answers to the same squeeze problem. Alex Jordan’s supplement shows why colorists reach for ACES — its controls protect shadows and highlights as you push, compressing rather than clipping, so grading feels more like film and less like breaking the image.

Choosing per project. Start with RCM for most single-facility jobs — fastest to stand up, plenty of control. Reach for ACES when you’re collaborating across vendors or want the broadest industry interchange (it’s been the standard longer). Drop to a manual CST pipeline when you need explicit, node-level control over exactly where each conversion sits. The honest answer, as Kelly says, is that all three give great results — the right one is whichever fits the job. (Ignore the HDR and derived-master sections at the end of the Blackmagic video; those are Level 3.)

Do it

1. Take a mixed-camera timeline (Blackmagic’s free training media works). First do it the manual way: input CST → one grade node → output CST, per Mostyn’s shape. Push offset hard and confirm it rolls off, not clips.
2. Now the RCM way: Project Settings → Color Management → DaVinci YRGB Color Managed, output Rec.709 / Gamma 2.4. Right-click each clip → Input Color Space and set its real camera pair. Confirm both cameras land on a common baseline.
3. Now ACES: duplicate the timeline, decouple its settings, set color science to ACEScct, ODT to Rec.709. Set each shot’s ACES input transform. Grab a still and wipe the ACES version against the RCM version — note the subtle, valid difference.
4. Write one sentence for this project: which of the three you’d ship with, and why.

Color management decision guide — RCM vs manual CST vs ACES, setup recipes for eachcolor-management-decision-guide.pdf119 KBOriginal course material — free to useLevel 2 workbook — every Do it exercise, 2.1–2.12, plus the capstone (printable)level-2-workbook.pdf799 KBOriginal course material — free to use

Terms introduced

Terms introduced in this lesson

• ACES
• ACEScct
• IDT / ODT
• Input / timeline / output space
• Scene-referred

Each term links to the glossary, where it is defined by the way you just used it.

Check

Check yourself

1. Why does Mostyn prefer a Color Space Transform at the END of the node tree rather than the start?

   You grade in the wide working space first, so pushes roll off smoothly instead of clipping against Rec.709’s smaller boundaryResolve requires itIt looks the same either way, so it doesn’t matterIt renders faster

2. In an ACES project, what do the IDT and ODT do?

   IDT sets resolution; ODT sets frame rateThey are two names for the same LUTThey add a creative lookThe IDT maps each source into ACES from its camera space; the ODT maps the graded result out to your target display

3. What is a scene-referred workflow, at intro depth?

   Grading by eye on an uncalibrated screenWorking with light values as the scene really was — before a display transform squeezes them to fit a screenA way to export at full levelsA preset that only works on Rec.709

4. Two shots — one ARRI, one Sony — look different after normalizing in RCM with a single preset. What fixes it?

   Switch the whole project to Rec.709Set each clip’s input color space to its real camera pair (right-click → Input Color Space)Increase saturation on the Sony shotRe-shoot the scene

Check answers

You can move on when you can… set up all three pipelines — a manual CST sandwich, RCM, and an ACES project — explain why the output conversion belongs last, and say in one sentence which you’d choose for a given project and why.

Mark this lesson complete

Go deeper

Blackmagic / Cullen Kelly — Color Management (the RCM-vs-ACES walkthrough): the fuller official comparison — ACES setup with per-shot input overrides, then RCM, then a side-by-side. Watch only the first ~22 minutes; the HDR and derived-master sections after that are Level 3.

Segment: 0:00–21:56 — ACES vs Resolve Color Management, side by sidewatch full video

Watch for: How tagging each shot’s real input color space snaps mixed cameras to a common start, and why ACES and RCM give subtly different — both valid — results.

Learn Color Grading (Alex Jordan) — The most powerful thing about ACES: why colorists like ACES: its controls protect shadows and highlights as you push, so aggressive moves compress instead of clipping. A good intuition-builder for scene-referred grading.

Watch for: The side-by-side where the same offset/lift/gain push clips in standard YRGB but rolls off protectively in ACES — the scene-referred behavior that makes wide-space grading feel safe.

Cullen Kelly — 36 Project Settings (color-management segment): the timeline-vs-output-space settings, the LUT pipeline slots, and broadcast-safe, explained one setting at a time.

Segment: 16:02–24:10 — Timeline vs output space, LUT pipeline, broadcast safewatch full video

Watch for: Where the timeline and output color spaces live in project settings, and how the LUT pipeline slots interact with color management.

Next up: 2.3 · Shot matching — the most-tested skill in the industry, done on the parade.