LTX-2.5's September: fourteen LoRAs, long clips and an HDR master

Seven weeks after LTX-2.5's open weights came out, most of what Lightricks has shipped for it is not about generating a new shot. It is about fixing, converting and finishing one — the work that normally happens in a compositing or grading tool.

Fourteen adapters in a month

Between 8 and 28 September Lightricks published fourteen adapters for the 22-billion-parameter LTX-2.5 on Hugging Face: twelve IC-LoRAs, which condition generation on footage or images you supply, and two plain LoRAs. In order: Day-To-Night; Deblur, Clean-Plate and Water-Simulation; Ingredients, Colorization, Decompression and the Cinemagraph LoRA; the Slow-Motion-Control LoRA; Layout-To-Render; Restore and Refine-Details; and finally Alpha-Gen and SDR-To-HDR.

Three of them are worth singling out. Alpha-Gen takes an ordinary RGB clip and returns an alpha matte — a key without a green screen — at up to 1920×1088 and 145 frames. Layout-To-Render turns a 3D viewport or clay animation, plus one styled image of the first frame, into a finished shot, which is how a previs becomes a render. SDR-To-HDR converts 8-bit footage to 16-bit HDR.

Longer clips in overlapping windows

Release 1.4.0 of the LTX-2 code, on 29 September, added chunked long-video generation: the clip is made in 97-frame windows, each carrying 25 frames over from the one before, with a crossfade at the seams. It is the model's way past its single-pass length without the jump a hard join leaves.

An HDR master, in one pass

The same release made SDR-to-HDR a single stage. It writes a 10-bit BT.2020 / HLG master alongside EXR frames, in ACEScg by default, or ACEScct or linear sRGB. 1.4.1 on 30 September streams the HDR output straight to EXR and HLG, and 1.4.2 on 2 October added the pipeline that runs Alpha-Gen.

And on smaller machines

1.4.0 also tiles the IC-LoRA transformer in 1024×1536 windows, which is what lets these adapters run on frames larger than the GPU would otherwise hold. Release 1.3.0 in August had already fixed installation on macOS — Apple Silicon runs through MPS — and fp8 with LoRAs on pre-Ada cards such as the RTX 3060 and A100.