Bytedance Seedream V4.5 Edit

Seedream V4.5 Edit is ByteDance's image-editing model over the WaveSpeed API, and its party trick is typography. The V4.5 line was built with enhanced text rendering in mind - posters, logos, UI mockups, signage - so if your edit involves changing words on a sign, adding a headline to a poster, or cleaning up garbled text in a render, this is the one you want. Vanilla edit models mangle text; this generation of Seedream is notably better at it.

It's also the "pay per edit" tradeoff, like the rest of this pack. There's no local Seedream - ByteDance keeps the flagship models closed, API-only (their open releases are the research components, not the image model). So this node is the realistic path to ByteDance-grade editing, at the cost of a per-edit bill and no local control over the pipeline.

How it works

The node sends your prompt and up to 10 reference image_urls to the WaveSpeed Seedream V4.5 Edit endpoint, waits for the render, and pulls the result into a ComfyUI IMAGE tensor. The image_url field accepts a single URL string or multiple URLs, which is how multi-image reference edits work. The output drops straight into your image chain like any other IMAGE.

Resolution works like the rest of the Seedream family: pick a size_preset (1:1, 4:3, 3:2, 16:9, etc.) or "Custom" and set width/height yourself, 1024–4096px on this tier.

The inputs that matter

• prompt - the modification description. If text is involved, spell out exactly what the new text should say.
• image_url - the image(s) to edit, as URL string(s), up to 10.
• size_preset / width / height - resolution control. Custom dims only matter when the preset is "Custom."
• seed - cache control. Randomize re-runs (and re-bills); a fixed value reuses the cached result.

enable_sync_mode waits for the result before returning, enable_base64_output returns base64 instead of URLs (useful for scripting), and show_aspect_ratio is cosmetic. The optional client input is for a WaveSpeed API Client node; otherwise the key comes from Settings.

Installing it

Part of the ERPK Collection (eRepublik-Labs/comfyui-nodes-erpk). ComfyUI Manager: search erpk → ERPK Custom Nodes → restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/eRepublik-Labs/comfyui-nodes-erpk.git erpk
cd erpk
pip install -r requirements.txt

You need a WaveSpeed API key (Settings → ERPK → API Keys). No model downloads - the pack's WaveSpeed dependency is just pydantic/requests/Pillow.

Common issues

• Source images must be reachable URLs - WaveSpeed fetches the image_urls itself. Localhost or private links fail; use the pack's upload helper or any public URL.
• Text still garbled? - V4.5 is better at text, not infallible. Keep the requested text short and unambiguous, and check your resolution - low outputs at 1024px can't hold legible small type.
• Billed per edit - it's a paid API. Iterate on the seed-pinned cached results where you can.
• Blank prompt errors - the node requires a non-empty prompt; same rule as the rest of the pack.