Free · browser-based · files stay local
Load the models, mark the one that is already right, and Nyans solves a colour transform
for each of the others — against the base-colour maps, not against a screenshot of the
render. Export each one as a .cube and a HALD PNG and apply it to the
original textures at full resolution.
Chrome, Edge, Firefox and Safari · no account · nothing uploaded
Why the maps
A grading LUT is one function applied to every pixel of the finished frame. That is exactly what you want for a look, and exactly what cannot fix a kit whose assets disagree with each other.
Feed a warm crate and a green crate through the same transform and they both move by the same rule. Warm the green one and the warm one goes further; correct the warm one and the green one follows. The frame gets a look, and the two crates still do not agree.
A marketplace buy, a scan shot under an overcast sky, a texture painted on someone else's monitor and a kitbash from an older project were each balanced against a different idea of neutral. The disagreement is baked into the maps, so that is where it has to be undone.
Nyans solves a separate colour transform for each asset, toward the reference asset's untouched palette. Each is exported on its own, so you apply it to that asset's maps and nothing else. The reference does not move; its colours are held while the others are solved.
Once the kit agrees with itself, the shared look is worth baking: Nyans exports it as a .cube, an Unreal 256×16 strip, a Unity 1024×32 strip, a ReShade lut.png or a HALD CLUT. That one goes on the frame, where a global transform belongs.
Workflow
Six steps in one browser tab. Nothing installs, nothing uploads, and the whole solve is a single undo step if you do not like it.
.bin and .mtl with it, up to 512 MB and 10,000 files..cube and a 512×512 HALD PNG per asset, plus a README with the ImageMagick lines that apply them — magick texture.png fix-crate_pine-hald8.png -hald-clut texture-fixed.png, and a mogrify line for a folder. The .cube is there for Substance, Nuke and anything else that prefers a 3D LUT.What it touches
The transform is applied to the maps and the scene lights the result — the same order the exported fix will be applied in. What you judge on screen is what the file does.
Those two maps are read and written, along with any flat colour factor the material multiplies them by, which is folded in first. Normal, roughness, metallic, ambient-occlusion, height and opacity maps are never touched. Alpha in the colour map is carried through unchanged, so a cutout stays cut out.
The grade goes on the map; the lights then fall on the graded map. Grading the rendered image instead would bake the key light, the shading and the camera angle into the correction — which is what you get if you screenshot a viewport and colour-correct that.
The fix is a colour lattice, so it applies to your 4K or 8K maps outside the browser at their own resolution. The preview works on a copy capped at 4096 pixels on the long edge; that governs what the viewport shows, not what the exported transform does.
Every asset's colour maps are laid out into one analysis surface, and that is what the scopes, Auto match, Auto balance and Harmonize sample. Two people looking at the same kit from different angles get the same solve.
Each exported fix starts from an identity transform and targets the reference's untouched palette, with the reference's own colours in the preserve set. It is a correction, not your grade — the creative look stays a separate export you can change later without redoing the kit.
Conversion, grading and the zip all happen in the tab. Models are kept in the browser on your own machine when there is room, and the filmstrip marks which are stored and which are session-only. A .nyans project file carries the whole package.
Formats
glTF 2.0 goes straight to the viewer. Everything else is normalised to glTF 2 by an Assimp build compiled to WebAssembly, in the tab, before it is shown.
| Family | Extensions | Route |
|---|---|---|
| glTF 2.0 | .gltf, .glb | Loaded directly, no conversion step |
| Autodesk FBX | .fbx | Converted to glTF 2 in the tab |
| Wavefront | .obj | Converted; bring the .mtl and maps in a zip |
| Collada | .dae | Converted to glTF 2 in the tab |
| Blender | .blend | Converted, with the caveat below; exporting glTF from Blender is the surer route |
| Solids & scans | .ply, .stl, .off, .3ds, .3mf, .amf | Converted; untextured meshes use their material colour |
| Game & DCC | .pmx, .md2, .md3, .md5mesh, .ms3d, .ase, .b3d, .cob, .iqm, .lwo, .lws, .mdl, .mdc, .smd, .x, .q3bsp, .q3d, .hmp, .nff, .ndo, .sib, .scn, .ogex, .mesh, .mesh.xml, .ac, .ac3d, .assbin, .bvh, .csm, .dxf, .xgl, .zgl, .3d, .md5anim, .md5camera | Converted to glTF 2 in the tab |
| Packaged | .zip | The scene plus its textures and side files. Up to 512 MB and 10,000 entries; the scene entry is picked for you |
That list is the set of extensions the Assimp build has enabled, so it is what the file picker will accept. A few of them are companion files — animation and camera takes — that carry no mesh of their own, and coverage of the older and more obscure formats varies with whichever exporter wrote the file. When a scene arrives wrong, exporting glTF or FBX from the application that made it is the shortest way through.
Limits
It is a colour transform on colour maps. Everything a colour transform cannot reach is still yours to solve, and it is better to know which is which before you start.
Nyans is a look-development and LUT tool, not a DCC. It does not edit meshes, rebuild materials or replace your engine's renderer.
FAQ
mogrify line for a folder. The .cube is for anything that prefers a 3D LUT, such as Substance or Nuke. Apply either to that asset's own colour maps, then re-import them..cube and a HALD PNG — a colour lattice rather than an image operation — so it applies to the original maps at whatever resolution they are. The in-app preview works on a copy capped at 4096 pixels on the long edge, which affects what you see in the viewport, not what the exported transform does..nyans project file keeps them with the rest of the board. There is no account and no server-side processing.