- What is a LUT and why would I use one?
- A LUT (Look-Up Table) is a colour transform stored as a 3D grid of RGB values. Photographers and filmmakers use them to apply consistent colour grades — cinematic looks, film emulation, mood correction — across many images at once. Instead of tweaking each photo individually, you create or download a single .cube file and apply it to your entire shoot in seconds.
- What is trilinear interpolation and why does it matter?
- A typical .cube LUT stores a grid of, say, 33×33×33 colour entries. Most pixel colours fall between grid points. Trilinear interpolation blends the eight surrounding grid corners to estimate the exact colour at any in-between point, giving smooth, accurate results that match what professional software (DaVinci Resolve, Premiere, Lightroom) would produce.
- What .cube sizes are supported?
- Any standard 3D .cube file (LUT_3D_SIZE 2–64 is typical; 17, 33, and 65 are most common). 1D LUTs (LUT_1D_SIZE) are not supported. Both .cube and .3dl (integer input/output format with MESH keyword) are accepted. If your .3dl file uses a non-standard layout, try converting it to .cube first with a free tool like Resolve's LUT editor.
- Is my data private? Are photos sent to a server?
- Yes, fully private. The entire pipeline — LUT parsing, image decoding, colour transform, ZIP creation — runs locally in your browser using standard Web APIs (Canvas, FileReader, JSZip). No pixel is ever uploaded or transmitted over the network.
- Can I use a partial strength LUT for a subtle look?
- Yes. The intensity slider lets you blend from 0% (untouched original) to 100% (full LUT). At 50% each output pixel is the average of the original and the fully-graded colour. This is equivalent to the "opacity" parameter in Lightroom's LUT profiles or the "Key Output Gain" in DaVinci Resolve.