Joy-LTX 2.5 x Z-Image GGUF — surfaces, textures, fine details, foliage
The purpose of this merge is surface rendering. Z-Image's spatial attention profile grafted onto Joy-LTX 2.5: straw with distinct strands, foliage that reads as leaves, physical ground litter, unretouched skin grain — identity, motion and sound untouched. Full method and calibrated expectations on the native repo; same-seed comparison stills attached.
Files (K-quant ladder, Q2_K → Q8_0)
| file | size class | note |
|---|---|---|
| Q8_0 | largest | quality reference |
| Q6_K / Q5_K_M | large | best quality-per-GB |
| Q4_K_M / Q4_K_S | mid | the RTX 30/40 sweet spot |
| Q3_K_M / Q2_K | small | low-VRAM, visible quality tax |
On Ampere (RTX 30/40) these GGUFs run 4–8x faster than the emulated 4-bit comfy-native arms — check your ComfyUI load log's "Native ops:" line; if your card isn't listed as native for a quant op, you want this repo. On Blackwell the comfy-native int8/nvfp4 files (native repo) are the fast picks instead.
Drop-in for any Joy-LTX 2.5 v2 GGUF workflow — same loaders, same settings, same seeds as the stock v2 quants.