Drop in a photo whose color and tone you want, then your own frame. Loupe reads both, builds a transform, and gives you an edit — plus a recipe you can dial in by hand.
About
Why Loupe exists.
Loupe started as a way to stop squinting at two photos side by side, trying to eyeball why one had "that" look and mine didn't. It reads the color, tone, and saturation of a reference photo and builds an actual transform from it — not a filter, an analysis — then hands you a Lightroom preset, a LUT, or just the finished photo, whichever you actually need.
It's free, it runs entirely in your browser (your photos never touch a server — there isn't one), and it'll stay that way. This page exists because hosting isn't quite free and coffee helps the debugging go faster. If Loupe saved you twenty minutes in Lightroom, and you feel like it, there's a coffee link in the footer. If not, genuinely, no hard feelings — go use the app.
Looking for how to actually use it? That's a separate, shorter page — the ? button up top.
Read this first
How to use Loupe.
A one-person side project for matching the color and tone of one photo to another. You're welcome to use it. No one is watching.
How it works, in four sentences
Drop in a reference photo — the one with the color/mood you love.
Drop in your photo — the one that currently looks nothing like it.
Hit Match. Loupe reads both images and builds a transform — not a filter slapped on top, an actual analysis of tone, color cast, and saturation.
Drag the sliders, export a Lightroom preset or a LUT, or just download the finished JPEG. Your call.
The part where I reassure you about privacy
Every pixel is processed inside your browser. Nothing uploads anywhere, nothing touches a server, nothing gets stored except in your own device's local storage — which is also where your saved "Looks" live. There is no database with your name on it. There is, in fact, no database. I promise this isn't the "free app" where you're secretly the product — there's no business model here at all, which is its own kind of honesty.
A few things worth knowing
Best references are cropped tight — no phone UI, no black bars, just the photo.
You can feed it multiple references at once for a "mood board" blend instead of one exact photo.
The Batch panel applies one look to a whole folder — handy, but maybe not on your phone's cellular data at a wedding.
Saved looks live in your browser only. Clear your browser data and, yes, they're gone — export your library occasionally if you're precious about them.
That's it. That's the whole manual. Go match some colors. And if something breaks, there's a quiet "Report it" link in the footer — I'd rather hear about it than have you assume it's just you. Curious why this exists at all? There's an "About" link down there too.
Reference
+the look you want one photo, or several to blend
Your frame
+the photo to edit JPEG · RAW (NEF/CR2/CR3/RAF)
Look library
saved on this device
Reference health
match reliability
Reference-only preset
photo-matching-app
Or copy this and save it as a .xmp file in Files
Built from the reference alone: its fade (black floor), contrast spread, saturation level, and the color cast in shadows, midtones, and highlights — written as absolute Lightroom settings including a tone curve. Without your photo to compare against, it describes the look itself; expect to trim exposure per shot.
Camera harmonization
Lightroom-first
Teach Loupe how each camera renders color, then export one look as Nikon / Canon / Fuji-specific Lightroom profiles and presets. Use JPEG exports, embedded RAW previews, or reference test frames; stronger results come from the same grey card or ColorChecker shot on each body.
Look DNA
portable look metadata
Look DNA stores the look as analyzed behavior — tone anchors, color grade, hue family bias, saturation character, skin protection note, and camera compensation hints — instead of only Lightroom slider positions.
Batch — apply this look
auto-match each photo
Each photo gets its own full analysis against the current reference — not one fixed recipe stamped across the set — using the Color and Tone slider values above. Loupe builds thumbnails for long-press saving and a single ZIP so Safari does not block a pile of automatic downloads. Pick a practical output size for fast previews, client selects, or higher-res handoff JPEGs.
Original
Matched
100%
20%
The recipe
Est. Lightroom
Something went sideways?
Report a bug
Tell me what happened — this opens your email app with the details already filled in, plus some harmless technical bits (browser, screen size) so I'm not troubleshooting blind. Your photos are never included; they never left your device in the first place.