ByteDance image generation and editing
Seedream 4.5 AI image generator
Turn a written brief into a finished image or revise existing artwork with direct instructions. Seedream 4.5 is built for reference-aware editing, readable visual text, controlled multi-image composition, and 2K or 4K output.
Seedream 4.5 AI image generator- 2K / 4K
- output quality
- 8
- aspect ratios
- 3000
- prompt characters
01
What Seedream 4.5 is good at
Seedream 4.5 combines text-to-image generation with instruction-based image editing. ByteDance reports improvements over Seedream 4.0 in prompt adherence, alignment, aesthetics, reference consistency, typography, and dense text rendering. That makes the model useful when the image must follow a brief instead of merely matching a broad style.
02
Features that matter in production
The strongest use cases are work that needs layout control, repeatable visual identity, or precise revisions.
Reference detail preservation
Keep facial features, lighting, color tone, and other source details while changing selected parts of an image.
Poster and logo composition
Create structured visual hierarchy for campaign posters, brand graphics, menus, covers, and presentation artwork.
Clearer text in images
Generate small or dense text more legibly, useful for title treatments, labels, packaging concepts, and editorial layouts.
Multi-image editing
Identify subjects and target elements across reference images, then combine or revise them with greater control.
Flexible canvas formats
Choose square, portrait, landscape, social, cinematic, and ultrawide ratios without rewriting the creative brief.
2K and 4K delivery
Use Basic for 2K drafts and High for 4K finals when surface detail or larger placement matters.
03
Practical ways to use Seedream 4.5
Build a campaign key visual
Start with the message and required hierarchy before adding aesthetic language.
- Name the product and audience
- Specify headline placement and focal subject
- Choose 16:9 or 4:3, then generate in 2K
Revise a product image
Upload the source and isolate the requested change so the product identity remains stable.
- State what must remain unchanged
- Describe one material, background, or lighting change
- Review in 2K, then render the approved version in 4K
Combine visual references
Give each source a role instead of asking the model to blend everything equally.
- Assign subject, palette, and layout references
- Describe their relationships in the final frame
- Use explicit exclusions to prevent unwanted carryover
04
Prompt templates worth adapting
Replace the bracketed details with real requirements. Specific constraints produce more useful drafts than adjective-heavy prompts.
Create a product launch poster for [product]. Place the product in the lower center with a clear silhouette. Add the headline “[headline]” in the upper third using readable condensed type. Use [brand colors], controlled studio light, and generous negative space. Do not add extra logos or copy.
Keep the subject’s identity, pose, camera angle, facial features, and background layout unchanged. Replace only [target element] with [new element]. Match the original light direction, shadow softness, color temperature, and depth of field.
Design an editorial cover about [topic]. Use one strong focal image, a precise grid, and the title “[title]”. Keep all text readable. Palette: [colors]. Mood: [mood]. Leave clear margins and avoid decorative filler.
Use image 1 for the main subject, image 2 for the color palette, and image 3 for the environment layout. Keep the main subject recognizable. Place it in [position], match the environment lighting, and exclude objects that appear only in the palette reference.
05
How to get a controlled result
Choose the right mode
Use Text to image for a new composition. Use Image to image when identity, layout, or lighting from a source must survive the edit.
Write the brief in layers
Lead with subject and purpose, then composition, text, lighting, materials, and exclusions. Keep each instruction testable.
Draft before the final render
Use 2K while comparing direction and layout. Switch to 4K only after the concept is approved.
Edit one decision at a time
For revisions, lock the elements that already work and request a narrow change. This makes before-and-after evaluation easier.
06
Supported inputs and output settings
- Text prompts up to 3,000 characters
- Reference files: JPEG, PNG, or WebP, up to 10MB each
- Ratios: 1:1, 4:3, 3:4, 16:9, 9:16, 2:3, 3:2, and 21:9
- Basic quality produces 2K; High quality produces 4K
- Each generation request returns one image
07
Seedream 4.5 questions
Can Seedream 4.5 generate and edit images?
Yes. Text to image creates a new visual from a prompt. Image to image sends your uploaded references to the Seedream 4.5 editing model.
What is the difference between 2K and 4K?
Basic quality returns 2K output and is suited to drafts. High quality returns 4K output for approved artwork that needs more detail.
Which image formats can I upload?
The editing API accepts JPEG, PNG, and WebP files. Each uploaded file can be up to 10MB.
How do I preserve a face or product during editing?
Name the exact details that must remain unchanged, then isolate the requested change. Include lighting, camera angle, color, and layout constraints when they matter.
Is Seedream 4.5 suitable for posters with text?
It is designed with improved typography and dense text rendering. Always proofread generated copy before publishing, especially small text and brand names.