--- name: scenario-seedream description: "Use when generating or editing images with Seedream models on Scenario via MCP: text-to-image, image-to-image editing with reference images, posters or packaging with exact in-image text (non-Latin scripts too), subject-preserving edits, sets of related images in one run, editing a transparent asset without losing its alpha, or splitting an image into transparent PNG layers with Layerize. Keywords: Seedream 5.0 Pro, Lite, Flash, 4.5, Layerize, ByteDance, txt2img, img2img, layer extraction." license: MIT --- # Scenario Seedream Images ## Overview Seedream, ByteDance's image family on Scenario, spans generation, reference-driven editing, and one member that only takes images apart: Layerize splits a finished image into editable layers. The members agree on little else, so discover them with `search` and read `model_schema_get` before every run. Connection and the core loop: see the `scenario` skill; model-agnostic image work: the `scenario-image` skill. If a sibling skill named here is missing from your available skills, ask the user to install it (`npx skills add scenario-labs/skills --skill `); unattended, proceed from tool schemas and flag the gap. ## Quick reference At authoring time (fields and caps are per member, read the live schema): | Member | References | Sizing | Notes | | ------------------ | --------------------------- | --------------------------------------------------- | ----------------------------------------------------------- | | 5.0 Pro | `referenceImages`, up to 10 | exact `width` and `height`, 672 to 3136 px, step 16 | exact in-image text; 3500-char prompt | | 5.0 Lite | `referenceImages`, up to 14 | `width` and `height`, up to 4K | fast and cheap; 2048-char prompt | | 5.0 Flash | `referenceImages`, up to 10 | exact `width` and `height`, 672 to 3136 px, step 16 | cheapest; `background` keeps a reference's alpha | | 4.5 | `referenceImages` | `size` (2K, 4K) plus `aspectRatio` enum | subject-preserving edits; `"auto"` ratio follows the source | | 5.0 Pro Layerize | one `image`, required | `size` tier: auto, 1K, 1.5K, 2K | splits, never generates; prompt optional | | 5.0 Flash Layerize | one `image`, required | `size` tier: auto, 1K, 1.5K, 2K | same contract minus `optimizePromptMode` | On the generators, mode follows from the inputs: empty `referenceImages` is text-to-image, one or more is an edit or a multi-reference generation (with several, the prompt gives each reference a role by position), and the array shape holds even for one asset. Sequence mode (`sequentialImageGeneration: "auto"` plus `maxImages`) lets Lite and 4.5 return a related set in one run, input plus generated capped at 15 images; Pro has no sequence fields. Price per image differs widely: a 2048 px square quoted 4 CU on Flash, 6 on Lite, and 18 on Pro at authoring time, and Pro took about two minutes against under one, so iterate on the cheap members and spend Pro on finals; `dry_run` both before a batch (the estimate prices the run exactly as submitted, a whole sequence included). Pro and Pro Layerize carry `optimizePromptMode`: the default `standard` reasons about the prompt first and is slower; `fast` costs the same and is usually enough when a reference already sets the composition (on Layerize it trades some split fidelity for speed). Flash's schema says `width` and `height` apply only when Resolution is Custom, but Flash has no Resolution field: the pixels apply directly. ## Keeping a transparent asset transparent Flash's `background: "transparent"` preserves alpha through an edit; it does not cut a subject out. It keeps the transparent surround, not translucency inside the subject: glass at alpha 170 came back near-opaque in one authoring-time test, so composite a translucent part in post. The field defaults to `opaque`, so a restyle that omits it flattens a valid cutout: set it on every run that must stay transparent. It applies only with exactly one reference image that already carries an alpha channel, and is ignored otherwise: a text-only run, a flattened JPEG reference, or two references all come back opaque without an error. So restyle or recolor an existing cutout (a sprite, an icon, a prop) on Flash with the PNG as the one reference, and check the result's alpha on the downloaded file before shipping it, since `asset_display` composites transparency away: with Pillow (`uv run --with pillow` when it is missing), `Image.open(path).getchannel("A").getextrema()` should start at 0 (fully transparent pixels exist), and an image with no `A` channel was flattened. To get a cutout in the first place, generate on a plain field and run background removal (the `scenario-image-editing` skill), or split the image with Layerize. ## Write the exact copy into the prompt Pro renders legible in-image text, multi-line layouts and non-Latin scripts included. Quote the exact strings in the prompt instead of paraphrasing them, give each a position and a size rank (headline across the top, date line small at the foot), and keep to a few elements at one or two sizes: letters are drawn, not typeset, so paragraphs and many small labels turn to shapes, and copy past that budget (tour dates, credits) is composited in post from the start. Proofread with `asset_display`; a word that garbles is spelled out letter by letter after the quoted string on the rerun, and one that still garbles goes to post. To swap copy on a reference, quote the new string, pin its position, and require the original typeface, size and color with everything else unchanged. ## Layerize: one image in, an editable stack out Layerize returns a base layer plus up to 16 transparent PNG cutouts, rebuilding the background behind whatever it lifts. The prompt picks the mode: empty runs a full automatic split; an enumerated list of parts ("Separate this poster into transparent layers: headline, product, shadow, background") cuts better than "all layers"; `x1 y1 x2 y2` on a 0 to 1000 grid, origin top left, confines the split to one region. Set `size` explicitly, since auto inherits the source's tier and the tier moves the price; cost is otherwise flat per run, not per layer. Layers come back cropped to their own bounds with bbox and z-index metadata, not aligned to the source canvas, and there is no PSD export. ## Worked example: a poster, then its layers 1. `search` with `target="models"`, `query="seedream"`, `public=true`. Prefer the newest non-deprecated hit for the job, e.g. `model_bytedance-seedream-5-0-pro` (a live hit at authoring time: re-discover each session). 2. `model_schema_get` with that id: sizing fields, caps, defaults. 3. `model_run` with that id, `dry_run=true`, and `parameters={"prompt": "Concert poster, teal and cream, screen-print grain. Headline \"MIDNIGHT ORBIT\" across the top, date line \"Nov 14, Union Hall\" small at the foot.", "width": 1600, "height": 2368}`; both sizing fields move price. 4. Rerun `model_run` with `wait=false`, then `jobs_wait` with the returned job id, re-called with `pending_job_ids` on timeout, never a second `model_run`. 5. `asset_display` and proofread the rendered text. 6. `model_schema_get` on the Layerize hit, then `model_run` with that id and `parameters={"image": "", "prompt": "Separate this poster into transparent layers: the headline text, the date line, and the background. Clean edges, complete transparency.", "size": "2K"}`. 7. `jobs_wait`, then `asset_display` each layer and `asset_download` the keepers. ## Common mistakes - Reusing one member's parameter block on another: pixels on Pro and Lite, tier enums on 4.5 and Layerize; pixels sent to an enum field are rejected. - Passing `referenceImages` to Layerize or `image` to the generators: the input field's name and shape differ per member. - Expecting Layerize layers to overlay the source directly: each is cropped to its own bounds, so reposition with the returned metadata. - Asking Pro for a sequence: the sequence fields existed on Lite and 4.5 only. - Moving a 3000-character prompt from Pro to Lite: prompt caps are per member. - Setting Flash's `background` to `transparent` on a text-only run or a flattened reference: it is silently ignored, and the image comes back opaque.