False Color Composer

runs 100% in your browser — nothing uploaded

Compose a false-color image from two source frames (e.g. VIS + IR). Channels are auto-aligned before compositing.

Homemade by alivenine. If you find any bugs or errors, please bear with it or report them to me at me@alivenine.fyi, and hopefully I'll fix them someday.

1 — Load images

Image 1

no file

Image 2

no file

2 — Assign channels

Advanced — channel registration runs automatically by default

R and B channels are auto-aligned to G before compositing. Override the method, or turn it off if your channels are already pixel-registered.

Enable image registration

3 — Compose & export

Loading OpenCV…

About this tool & its limits

Everything runs client-side in WebAssembly — your images never leave this device, and nothing needs a server.
Browsers cap canvas dimensions at roughly 16,384 px per side. A single sensor frame is fine; a very wide stitched panorama may exceed it and will be rejected rather than silently cropped.
Very large frames (100+ MP) can take several seconds and a few hundred MB of memory to align and compose — expect a wait, not a freeze.
Registration is translation/affine only (feature matching, cross-correlation, or intensity-based) — it does not correct lens distortion or perspective.
JPEG export is lossy (85% quality by default). For quantitative or scientific use, export PNG or TIFF instead.
TIFF export is uncompressed 8-bit RGB, single strip — no 16-bit depth, no compression, no multi-page.