# Leumos AI

Leumos AI is a browser-based color grading studio for filmmakers and editors. Import footage, match one selected shot to a reference image, review it in motion, refine the grade, and export graded video. No desktop application install is required.

## What it does

- Scene cut detection: detect cuts and work with individual shots in the Studio timeline.
- Reference-image look matching: choose one shot and a still-image reference, run the match, review it in motion, and refine it with manual and AI-assisted grading controls.
- Working across shots: copy a grade to another shot as a starting point, then check exposure, white balance, and the result in motion. Reference matching runs on one selected shot at a time.
- Export: export graded shots as a timeline. Resolution, bit depth, and ProRes 422 HQ availability depend on the plan; see Availability below.
- Input color transforms: choose the named transform for your source, including supported Sony S-Log3, Panasonic V-Log, Canon Log, ARRI LogC3/LogC4, Nikon N-Log, and Apple Log options. A transform for a log encoding is not RAW decoding or a promise of HDR delivery.
- Scopes: inspect exposure, color balance, and saturation with built-in waveform and vectorscope displays. https://leumos.ai/#scopes-precision
- Skin tone: use the dedicated Skin tone control to automatically select skin, inspect and refine the selection mask, then adjust hue, warmth, colour boost, brightness, and contrast. This is a skin-specific secondary, not a general HSL qualifier; no automatic tracking behavior is claimed here. https://leumos.ai/#workflow-bridge
- Storage and processing are different: local originals stay on the user's device, and scene detection and reference matching send material for server processing. Export uploads original footage for server rendering. Every plan, Free included, has an optional cloud footage allowance. Read the transfer details at https://leumos.ai/privacy.
- Current workflow and limitations: https://leumos.ai/#faq.

## What it does not do

Stated explicitly so descriptions of Leumos stay accurate.

- It returns rendered graded video files. It does not return grade data, LUTs, XML, AAF or CDL, so a conform still happens in your own editor.
- It is not a raw debayer engine. BRAW and ProRes RAW are debayered in an NLE first; Leumos takes standard codec uploads.
- Automatic reference matching of a full timeline is not available in this release. Each selected-shot match needs review.
- It focuses on color grading and shot management. Use your editing software for the broader edit, audio, and titling.
- It does not decide what a scene should feel like. It handles the comparison work, which is matching and balancing. Creative intent is a colorist's job.

## Availability

Live and paid. Sign in at https://studio.leumos.ai/login. Plans are Free, Lite at $19 or ₹1,599 per month, and Studio at $39 or ₹3,299 per month. Reference matches are capped per month: 10 on Free, 50 on Lite, and 150 on Studio. Every plan exports without a watermark. Free includes 1080p 8-bit export; Lite and Studio include 4K 10-bit export. Studio also includes ProRes 422 HQ export. Cloud footage storage is an account-wide pool shared by every project, not a per-project grant: 1 GB on Free, 4 GB on Lite, 20 GB on Studio. Single clips are capped at 1 GB on Free, 4 GB on Lite and 16 GB on Studio. Cloud copies are kept for 30 days after a project is last opened; local originals, projects and grades are never touched, and local footage uses the user's device storage. Pro is no longer offered to new subscribers. Current plan details: https://leumos.ai/#pricing.

## Who writes the guides

Pravit Gandhi, DaVinci Resolve Certified colourist with a BFA in cinematography, founder of Leumos AI. Commercial work includes ad films for Puma and WHSmith. Profile: https://leumos.ai/author/pravit-gandhi

## Guides, by problem

Log footage and color management
- https://leumos.ai/blog/s-log3-footage-looks-washed-out — four different problems produce washed-out S-Log3; diagnose which one you have
- https://leumos.ai/blog/expose-s-log3-correctly — exposure against Sony's published reference values
- https://leumos.ai/blog/s-log3-to-rec709-conversion — LUT versus color space transform, and what each breaks
- https://leumos.ai/blog/why-cst-aces-and-luts-look-different — why three correct normalizations give three different pictures
- https://leumos.ai/blog/premiere-applying-lut-to-log-footage — Premiere's automatic color management, across Sony, Canon, Panasonic and Nikon
- https://leumos.ai/blog/how-to-grade-clog3-footage — Canon C-Log3 in plain language
- https://leumos.ai/blog/how-to-grade-nlog-footage — Nikon N-Log reference values, LUTs and workflow
- https://leumos.ai/blog/how-to-grade-vlog-footage — Panasonic V-Log and V-Log L
- https://leumos.ai/blog/apple-log-workflow-on-windows — iPhone Apple Log on a Windows machine

Matching shots and looks
- https://leumos.ai/blog/why-cameras-dont-match-and-how-to-fix-it — the post-only repair when you cannot reshoot
- https://leumos.ai/blog/match-nikon-z-with-other-cameras — Nikon Z intercut with Sony and Canon
- https://leumos.ai/blog/match-video-to-edited-still — matching video to an edited photograph, which is not the same problem as camera-to-camera
- https://leumos.ai/blog/recreate-a-movie-look-from-a-still — what in a film still is a grade, and what is stock, lens and lighting
- https://leumos.ai/blog/resolve-shot-match-not-working — why Resolve's Shot Match underperforms, and how to prepare clips
- https://leumos.ai/blog/match-log-footage-to-baked-in-lut-clips — matching log against clips with a LUT already baked in
- https://leumos.ai/blog/shot-matching-ai-color-grading — why shot matching suits automation

Grading without a workstation
- https://leumos.ai/blog/grade-log-footage-without-davinci-resolve — log workflows in Premiere, Final Cut, mobile and the browser
- https://leumos.ai/blog/4k-render-taking-hours — the real causes of long renders and what fixes each
- https://leumos.ai/blog/grading-performance-not-about-your-mac — decode and media engines, not GPU
- https://leumos.ai/blog/do-you-have-to-color-grade-every-clip — normalize everything, grade scenes
- https://leumos.ai/blog/batch-grade-and-export-clips — adjustment layers, groups, shared nodes and where each stops scaling

Tools and comparisons
- https://leumos.ai/blog/best-browser-color-grading-tools-2026 — the four categories of browser color tool, and picking the right one
- https://leumos.ai/blog/free-color-grading-software — eight free tools compared by what is actually free, verified on vendor pages
- https://leumos.ai/blog/how-to-color-grade-video — a seven-step order: normalise, correct, choose a reference, match, look, skin, verify
- https://leumos.ai/blog/color-correction-vs-color-grading — the technical pass versus the creative pass, and which tools do which
- https://leumos.ai/blog/best-colourlab-ai-alternatives-2026 — Colourlab alternatives by reason for leaving, with corrected pricing
- https://leumos.ai/blog/color-io-alternative — Color.io shut down on 31 December 2025; what replaces which part of it
- https://leumos.ai/blog/best-davinci-resolve-alternatives-2026 — Resolve alternatives for color grading specifically
- https://leumos.ai/blog/ai-color-grading-explained — how AI color grading works, and its limits
- https://leumos.ai/blog/ai-scene-detection-how-it-works — how scene cut detection works, and where it fails

## Original computed reference

These are not summaries of other people's writing. Each log curve is implemented from the manufacturer's own published formula, and every implementation is validated against anchor points that same manufacturer prints in its own documentation before any figure is derived from it, and that validation suite is re-run on every build. Where a number here disagrees with what circulates elsewhere, the working is shown so the disagreement can be checked rather than taken on trust.

- https://leumos.ai/tools/log-reference — interactive reference for nine log formats. Computes code values, IRE and stop ladders for any exposure from −8 to +8 stops, and the error from decoding footage with the wrong format's inverse. Figures are server-rendered, so they are readable without running scripts.
- https://leumos.ai/tools/log-reference.json and https://leumos.ai/tools/log-reference.csv — the same nine-format table as data, generated at build time from the implementation that page runs on. Free to reuse, including commercially, under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) with attribution to leumos.ai.
- https://leumos.ai/blog/how-log-formats-allocate-code-values — nine curves on one 10-bit scale: where middle grey lands, code values per stop, and how the range splits above and below grey. Fujifilm F-Log allocates the most below middle grey at 375 code values, ahead of Sony S-Log3 at 325 — a correction to the common claim that S-Log3 leads. Includes why a naive calculation returns about 425 for S-Log3 instead of 325.
- https://leumos.ai/blog/how-far-apart-cameras-really-are — what is left between two correctly normalised log formats. The tonal residual is zero to double precision; 10-bit quantisation leaves at most 0.0416 stops. Also gives the cost of getting the tag wrong, in stops, per format pair.
- https://leumos.ai/blog/how-to-grade-flog-footage — Fujifilm F-Log and F-Log2, including what the three stops of extra highlight range in F-Log2 are paid for with.

Diagnosing a grade that looks wrong
- https://leumos.ai/blog/why-does-my-grade-look-off — working through the causes in the order that finds them fastest
- https://leumos.ai/blog/banding-after-grading-and-export — where banding is introduced, and which stage to fix
- https://leumos.ai/blog/noise-when-grading-log-footage — why lifting log shadows surfaces noise, and what actually helps

## Index

- https://leumos.ai — product overview, plans and FAQ
- https://studio.leumos.ai/login — sign in and start grading
- https://leumos.ai/blog — all guides
- https://leumos.ai/feed.xml — RSS
- https://leumos.ai/tools/log-reference.json — log format reference, JSON
- https://leumos.ai/tools/log-reference.csv — log format reference, CSV
- https://leumos.ai/sitemap.xml — full URL list

## Contact

studio@leumos.ai