Browser-Based Color Grading for Ad Films: No Install | Leumos AI

Browser-based color grading for ad films and commercials lets a colorist open ARRI Alexa or RED ProRes footage, conform a 15-60 second spot, and start matching brand references inside a Chrome tab — no $4,000 GPU, no 200GB Resolve install, no waiting for the studio workstation to free up. For agency-client-director review cycles where the brief changes between Tuesday and Thursday and the Pantone reference has to land within a few delta-E, the value of working in a browser is simple: you can grade from a hotel room in Mumbai, send a link to the agency in London, and the creative director can scrub the timeline on her iPad without downloading a single file.

I've been a colourist for four years and most of my paid work sits in the commercial bracket — Puma, WHSmith, a handful of regional spots for FMCG brands that you've never heard of but have definitely walked past in an airport. The grading turnaround on these jobs is almost always five days from offline lock to broadcast master, and the agency-client-director triangle eats two of those days in revisions. That means the actual grading window is closer to 72 hours, often less. Anything that shortens the first pass — the part where you're conforming, balancing shots, and getting the timeline to a watchable baseline — is worth real money.

This page is for people who ship commercial work and want to understand where browser-based grading actually fits, what it does well, what it still can't do, and how I'm thinking about the workflow for ad film colorists specifically.

The bottleneck on a commercial grade isn't the look — it's the rounds

If you grade ad films you already know this, but it's worth saying out loud: the creative grade on a 30-second spot is usually decided in the first six hours. You build a hero look on the strongest shot — often the brand product beauty frame — and then spread it across the timeline. The rest of the week is rounds. Round one with the director. Round two with the agency creative director. Round three with the client's marketing lead, who will ask you to push the red of the logo "just a touch warmer" without being able to articulate where they want it to land. Round four is the brand guardian asking if the on-pack red matches Pantone 186 C.

Desktop tools like Resolve, Baselight, and Nucoda are unbeatable for the first six hours. They're brutal for rounds five through twelve, because every revision means a new render, a new Frame.io upload, a new email thread, and a new version number that nobody can keep straight. A browser tool changes the geometry. The grade lives at a URL. The agency opens the URL. Revisions are scrubbable. That's the part of the workflow I'm building for.

What ARRI Alexa and RED footage actually needs from a browser tool

Most of the commercial work I see lands in one of two camera buckets. ARRI Alexa Mini or Mini LF shot to ProRes 4444 in LogC3 or LogC4. RED Komodo or V-Raptor shot to R3D or transcoded to ProRes 4444 in REDLogFilm or Log3G10. The colorimetry is forgiving — both manufacturers ship excellent IDTs and color science — but the files are heavy. A two-minute Alexa ProRes 4444 selects reel can sit at 30GB. A browser tool that asks you to upload that is dead on arrival.

The realistic browser workflow is proxy-based. You generate ProRes Proxy or DNxHR LB versions of the offline-locked timeline — 800kbps to 2Mbps, 1920x1080, with the agency's burn-ins baked off — and grade those. The look you build gets exported as a LUT or a sidecar metadata file, and your final master render still happens in Resolve or wherever the conform is sitting. The browser is the creative surface and the review surface. The desktop is the render farm.

This is the workflow I'm building Leumos AI around. The Input Color Space LUT handles the LogC3 / Log3G10 / S-Log3 / BRAW / V-Log → Rec.709 transform in one click, so you're not fighting the gamma before you start. AI Scene Cut Detection chops the proxy upload into shots on a timeline automatically — no node-per-clip setup like Resolve, just a thumbnail strip you can grade across.

If you're an ad film colorist or commercial DP, we're building this for you. Leumos AI launches in ~30 days — join the early-access list and you'll be in the first 500 (50% off the first year).

Reference matching is how commercial grades actually get briefed

No agency creative director hands you a node tree. They hand you a JPEG. It's a still from a Ridley Scott Associates spot, or a frame from Rachel Morrison's Apple work, or the high-contrast brand films Greig Fraser shot for a luxury watch campaign. The brief is "this, but for us." Your job for the next hour is to reverse-engineer the colorist's choices — where they sat the blacks, how warm the skin tones run, where the highlights roll off — and rebuild it on your footage.

That reverse-engineering used to be the entire skill. You'd eyeball the still on a calibrated reference monitor, sit next to a colorist who'd been doing it for twenty years, and learn by watching them push wheels. The skill still matters — knowing why a frame works is different from being able to match it — but the matching itself is now something AI does in seconds. Reference Image Grading takes the JPEG the agency sent and generates a starting grade matched to your footage with an intensity slider. You're not throwing away your eye, you're skipping the forty minutes it would have taken to land a rough match manually so you can spend that time on the parts that need a human: skin, brand color compliance, the lift on the hero shot.

For cohesion across the spot, Match All equalizes exposure, contrast, saturation, and hue across every shot in the timeline. On a 15-second spot with eight cuts shot across two days of different light, that one click saves you the first balancing pass entirely.

Where Pantone-mandated brand colors get tricky

This is the part where I have to be honest. AI color grading — Leumos included — is not the right tool for brand color compliance. If the brief says the on-pack red must match Pantone 186 C within delta-E 3 across all broadcast deliverables, that's a job for a vectorscope, a calibrated monitor, a qualifier, and a colorist who knows how to pull a secondary on a brand mark without contaminating skin tones nearby. No browser tool — including mine — replaces that work.

What browser tools can do is get you to the version where the brand red is roughly correct and the rest of the frame supports it, in about a tenth of the time. The Pantone-accurate pass is the last 20 minutes of a five-hour grade. Browser tools collapse the first four hours.

Similarly, mixed-lighting reception scenes for non-commercial work, day-for-night creative pulls, and any grade where the look is the creative idea rather than supporting the creative idea — those are still desktop jobs. I'd no more grade a feature in a browser than I'd cut one in iMovie. Different tool, different job.

How the five-day commercial turnaround actually compresses

The pitch isn't "replace your Resolve license." The pitch is: the first day of a commercial grade — proxy ingestion, log-to-Rec.709 conversion, shot balancing, reference matching, hero look on the beauty frame — collapses from eight or nine hours to about two. You bring the result into Resolve for the surgical work: brand color qualifiers, skin tone nuance, the breath of contrast on the close-ups, the final conform against the online edit. Then the rounds happen in the browser, where the agency and client can actually see the work without you hand-holding a Frame.io review session.

When Leumos AI launches in ~30 days, this is the workflow I want it to support. Manual Primaries handles the surgical exposure and white balance pulls. The Preset LUT Library gives you a curated cinema starting point with an intensity slider, plus you can upload your own .cube files for client-specific show LUTs. The Manual Cut Tool catches the shots the AI scene detection misses on whip pans or match cuts.

It won't replace Resolve. It'll replace the part of your week where you're doing the same balancing pass for the eighth time because the client wants to see what the spot looks like "a bit more cinematic, you know, like that Skyfall night exterior" — the Roger Deakins grade that gets name-checked in 60% of the briefs I get. With a reference-image workflow you can show them that direction in five minutes instead of forty.

If you're an ad film colorist or a commercial DP looking at where browser-based grading sits in the next two years of this craft, the early-access list is open. First 500 signups get 50% off the first year of Creator or Pro.

Frequently asked questions

Is browser-based color grading actually usable for broadcast-deliverable commercial work?

For the creative grade and client review portion, yes. For the final broadcast master, you still want to render out of Resolve, Baselight, or whatever your facility uses for QC and deliverables. The realistic workflow is: grade proxies in the browser, export a LUT or sidecar, apply that to your full-resolution timeline in Resolve, and master from there. The browser is your creative and review surface, not your render farm. That split is honest about what each tool does best.

How do you handle Pantone brand color compliance in a browser tool?

Honestly, you don't — not for delta-E-accurate compliance. Brand color matching requires calibrated monitors, vectorscopes, secondaries pulled with proper qualifiers, and a colorist watching for skin tone contamination. No browser tool replaces that workflow. What Leumos AI will do is get you to a version where the brand colors are in the right neighborhood and the rest of the frame supports them, then you take it into Resolve for the precision pass. That last 20 minutes is non-negotiable.

What file formats and cameras will Leumos AI support at launch?

The Input Color Space LUT handles S-Log3, C-Log3, BRAW, V-Log, LogC3, and Rec.709 transforms in one click. Upload-wise, ProRes Proxy and DNxHR LB are the realistic browser workflow — a 30GB Alexa ProRes 4444 file isn't uploading anywhere on agency Wi-Fi. The pattern is: generate proxies of your offline-locked timeline, grade those in the browser, export a LUT, apply it to the full-res master in your conform tool. That's how every browser-based grading workflow has to work, including mine.

Can the agency-client-director triangle actually review work without downloading anything?

That's the core reason I'm building this. Once early access opens, the workflow will be: the grade lives at a URL, you share that URL, the agency CD opens it in Chrome on her laptop, the client opens it on an iPad, scrubs through, leaves notes. No Frame.io upload, no version-numbered MP4 export, no email thread with four people arguing about which v07 is the latest. The grade is the source of truth. That alone shaves a day off the round-cycle on a typical five-day commercial.

How does AI reference matching compare to manually matching a director's reference still?

Manual matching on a strong reference — a Rachel Morrison Apple frame, a Greig Fraser brand film — takes 30 to 60 minutes if you're good and you're sitting in front of a calibrated monitor. Reference Image Grading lands the rough match in seconds, with an intensity slider so you can dial it back. You still need a colorist's eye to know what to keep and what to ignore — AI matching sometimes pushes saturation in the skin tones in ways you don't want — but the first-pass time goes from an hour to about five minutes.

What does Leumos AI cost and when does it launch?

Launching in approximately 30 days from when this page went up. Pricing tiers: Free at $0/month with 2 uploads/day and 400MB file max for testing the tool. Creator at $15/month with 8 uploads/day and 1GB max for solo colorists and small spots. Pro at $39/month with 20 uploads/day and 2GB max for working ad film colorists running multiple jobs a week. First 500 early-access signups get 50% off the first year of either paid tier. After that the pricing reverts to standard.

Will browser-based grading replace Resolve for commercial work?

No, and anyone telling you that is selling you something. Resolve is unbeatable for surgical secondaries, brand color compliance, complex node trees, finishing, conform, and broadcast delivery. What browser-based grading replaces is the first-pass balancing, the reference matching, the rough creative direction, and the entire review cycle with the agency and client. That's roughly 60% of the time on a typical commercial grade. The other 40% — the part that actually needs a colorist's hands on real tools — still lives on the desktop.

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Leumos AI launches mid-2026. The first 500 early-access signups get 50% off the first year. Join the early-access list →