Krea 2 Text-to-Image Workflows
Overview
Krea 2 is a 12B-parameter Diffusion Transformer from Krea.ai (released June 2026, weights open-sourced under the Krea 2 Community License, free commercial use up to 50 seats). Two variants:
- Krea 2 Raw is the base checkpoint before extra post-training. For fine-tuning / maximum fidelity, more steps.
- Krea 2 Turbo is post-trained and distilled; it generates in ~8 steps at cfg 1. This is what the krea2 txt2img packs ship.
Three packs (V2 — no group toggles)
Sliced from the KREA2 ULTRA V2 monolith into standalone single-pipeline packs. Pick by how you prompt and what you want:
krea2-txt2img-manual: plain prose prompt (theMANUAL PROMPTnode).krea2-txt2img-json: Ideogram-4-style structured JSON / area prompting (Ideogram4PromptBuilderKJ).krea2-combo: two-pass detail boost, a first pass then a low-denoise refine (denoise 0.3), with the krea2 turbo LoRA @0.2 on both passes plus the optional IdeoKrea LoRA. JSON/Ideogram-style prompting; saves both passes to compare.
Each pack's one prompt source is active (no prompt-mode bypass to flip).
ImageSharpenKJ runs before SaveImage. V2 adds the Krea2T-Enhancer MODEL
detail-boost patch (ships active) and drops v1's ConditioningKrea2Rebalance.
RBG_Smart_Seed_Variance ships bypassed (optional, see below).
Krea 2 has native ComfyUI support (comfy/text_encoders/krea2.py, ComfyUI ≥
v0.26.0). The CLIPLoader uses type=krea2, with a Qwen3-VL 4B text
encoder and the Qwen image VAE. The Qwen3-VL encoder drives strong prompt
adherence and structured-JSON prompts.
Models (all from the Aitrepreneur/FLX mirror; official: krea/Krea-2-Turbo)
| Slot | File | Notes |
|---|---|---|
diffusion_models/ | krea2_turbo_fp8.safetensors | 12B Turbo, fp8 — RTX 4000/3000/2000 |
diffusion_models/ | krea2_turbo_mxfp8.safetensors | RTX 5000 (Blackwell) native fp8 |
text_encoders/ | qwen3vl_4b_fp8_scaled.safetensors | Qwen3-VL 4B encoder |
vae/ | qwen_image_vae.safetensors | Qwen image VAE |
loras/ | krea2_turbo_lora_rank_64_bf16.safetensors | turbo LoRA — combo only, @0.2 both passes |
loras/ | IdeoKrea-test.safetensors | OPTIONAL Ideogram-style LoRA (Aitrepreneur/IdeoKrea) — combo add-in |
Node stack
- core:
UNETLoader(krea2_turbo) →CLIPLoader(type=krea2) →VAELoader(qwen_image_vae), wired via KJNodesSetNode/GetNodebuses into a subgraph (CLIPTextEncode→KSampler→VAEDecode). An rgthreeAny Switchsits in front of the encoder; in each pack only that pack's prompt source is wired to it (manual node in-manual, JSON builder in-json). - rgthree-comfy: Power Lora Loader, Any Switch, Label, Fast Groups.
- ComfyUI-KJNodes: Set/Get,
Ideogram4PromptBuilderKJ,ImageSharpenKJ,INTConstant. - ComfyUI-Krea2T-Enhancer (
capitan01R):Krea2T-Enhancer, the V2 MODEL→MODEL detail-boost patch, wired in the model path (PowerLora → Krea2T-Enhancer → sampler). Ships active; bypass to compare against the un-boosted result. - ComfyUI-RBG-SmartSeedVariance:
RBG_Smart_Seed_Variance, optional, ships bypassed in the positive-conditioning loop. - ComfyUI_essentials (
cubiq):ImageResize+, combo only (the two-pass VAE-roundtrip resize).
Settings that matter
- steps 8, cfg 1. Turbo is distilled; more steps or higher cfg over-cooks it.
- sampler
er_sde, schedulersimpleare the verified defaults. - 1920×1080 default; Krea 2 handles a wide aspect range.
- The prompt source is fixed per pack (manual node vs JSON builder). There is no prompt-mode bypass to flip.
V2 detail boost (Krea2T-Enhancer) + combo
Krea2T-Enhanceris a MODEL→MODEL patch (the V2 "massive detail boost"). It sits inline in the model path and ships active in all three packs. Widgets are[on, strength, …]; bypass it (or toggleon) to A/B the boost.krea2-combois the full demonstration of the boost, a two-pass refine: FIRST PASS (8 steps,er_sde, denoise 1) → VAE roundtrip → SECOND PASS (4 steps,euler, denoise 0.3), with the turbo LoRA @0.2 on both passes. It SAVES BOTH passes so you can see the boost. The IdeoKrea LoRA is downloaded but NOT wired by default. Drop it into the Power Lora Loader's empty slot (start ~0.5 to 1.0; it's a test LoRA) for the turbo + IdeoKrea Ideogram-style combo.
Optional post-proc (ships bypassed — un-bypass to use)
All packs leave RBG_Smart_Seed_Variance in the positive-conditioning loop
bypassed (passthrough). Un-bypass on the live canvas with panel_set_node_mode
(or in the UI) for controlled variations of the same prompt without changing the
composition. Set its seed mode to randomize and tune the variance mode (e.g.
🌿 Balanced) / strength widgets. Leave bypassed for a deterministic result.
JSON / area prompting
Like Ideogram 4, Krea 2's Qwen3-VL encoder reads structured prompts (per-region
desc + bounding boxes + palettes). For structured prompting use the
krea2-txt2img-json pack; its Ideogram4PromptBuilderKJ drives the encoder
directly (no bypass to flip). After the render, VERIFY the image matches the JSON
you set (view it) BEFORE continuing; if it doesn't, a field is probably stale.
Fix and rerun. Gotchas learned the hard way:
- Set ALL the builder fields, not only the prompt/boxes:
background,technical,style,lighting(widgets 3/5/6/7). Leaving stale values leaks content (a leftover celebrity portrait bled into a tea still-life). - Keep palettes minimal or empty. A top-level palette with many colors can render as a
literal color-swatch strip down the edge of the image. Empty
palette: [](top-level and per-box) gives a clean full-frame result. - Add "no people / single full-frame photograph" to
stylefor object/landscape scenes. Krea 2 follows it well.
Verification status
- v1 (
-manual/-jsoncore graph): render-verified, crisp 1920×1080 / 8 steps / cfg 1 / er_sde (snow-leopard prose + tea-still-life JSON with each object in its bbox). - V2 additions (the
Krea2T-Enhanceractive patch + thekrea2-combotwo-pass) are statically validated (clean slice + structural lint) but not yet live-rendered. They need theComfyUI-Krea2T-Enhancernode, the turbo/IdeoKrea LoRAs installed, and a healthy ComfyUI. Re-runscripts/verify-render.mjsonce those are present. - Note: the
ImageSharpenKJ(rcas 0.55) beforeSaveImageis active. Bypassing it drops the image link (a converter gap: bypass-passthrough doesn't cross a subgraph IMAGE output), and the contrast-adaptive sharpen suits Krea 2's crisp look anyway.
Gotchas
CLIPLoader: 'krea2' not in list→ ComfyUI too old; update to ≥ v0.26.0.Torch not compiled with CUDA enabled→ reinstall torch for your CUDA tag (--index-url https://download.pytorch.org/whl/cu128).
Sources
- Official: none found.
- Empirical: sampler values, wiring, and prompt notes from working graphs in
packs/and observed renders; not a vendor prompting guide.
