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Describe the image you want to create
0/20000A room photograph can suggest several directions: lighter walls, a different chair fabric, or softer daylight. On Seedream 4.0, use Nano Banana 2.1 to describe a specific edit and compare the result with the original.
A useful editing request explains both the part to explore and the surrounding details to inspect afterward.
Provide the main photograph as a reference, then state its role in the prompt. You can use up to 14 images, in JPEG, PNG or WebP format, with a 30 MB limit per file.
The prompt can contain up to 20,000 characters. Specify the surface, material, light direction and elements you want retained. Even an image-based request needs a written prompt.
A fixed aspect ratio close to the original can make side-by-side inspection easier. Choose from 15 settings including Auto, with 1K, 2K or 4K output.
Nano Banana 2.1 is an additional model on Seedream 4.0; selecting it does not replace the other image tools. New settings begin at 1K resolution, Auto framing and JPG. Change these before submitting if your study needs a particular shape or file type.
A generated interior is an interpretation of a prompt, not a measured renovation plan. Compare doorways, furniture geometry, shadows and object counts with the original. For materials or products, verify the real color and finish separately before making a purchase decision.
For example, use one image for the room and another only for a fabric color. Say so explicitly rather than asking the model to combine everything.
A wall-color study is easier to judge when you have not also requested different furniture, windows and lighting in the same prompt.
Output controls help organize your study; checking the image remains part of the work.
A 1K study costs 2 credits; 2K costs 4 and 4K costs 6. References do not add a separate charge. Every new submitted study is another generation.
Use the same selected ratio across variations when that helps comparison. Inspect the crop and perspective yourself: requesting preservation is not a guarantee that geometry will remain unchanged.
Choose JPG or PNG before generating. Review the saved image at a useful zoom level, particularly around edited edges. PNG is a file-format option, not a transparent-background switch.
Use photographs you can work with and compare the output against visible details in those references.
Upload a room photo and choose 4:3: “Use image 1 as the room reference. Change only the rear wall to a muted clay pink. Keep the window positions, floor pattern and furniture arrangement as shown. Retain the existing daylight direction.” Check corners and window edges for unintended changes.
Add a chair photograph and a fabric reference: “Image 1 defines the chair and camera view. Image 2 is a color and texture reference for the seat upholstery only. Replace the seat fabric with that material; keep the wooden frame and background.” Review seams, fabric scale and the chair silhouette.
Make the scope small enough that you can tell whether the edit helped.
Select Image to Image and upload the main reference. Add material or lighting references only when useful, and identify their roles in the required prompt.
Name the intended surface or object, choose the ratio and output format, and review the resolution-based credit cost before signing in and submitting.
Check perspective, outlines and surrounding details. Download the result and find the task again in My Creations; use a new, focused request for the next study.
Materials, framing and the practical limits of working from references.
The price is 2 credits for 1K, 4 for 2K and 6 for 4K on Seedream 4.0. Adding reference images does not add a separate fee, but submitting another variation creates another charged task.
Describe the room photo as the composition reference and the swatch as a material reference for a named surface. Up to 14 JPEG, PNG or WebP images are accepted, each up to 30 MB. Public HTTP(S) image URLs must be accessible and meet the same format and size limits.
Nano Banana 2.1 offers auto, 1:1, 2:3, 3:2, 1:4, 4:1, 3:4, 4:3, 4:5, 5:4, 1:8, 8:1, 9:16, 16:9, 21:9. Those are 15 choices including auto. Pick a fixed ratio when it helps comparison and choose 1K, 2K or 4K independently.
Do not treat the result as a dimensionally accurate drawing. Ask the model to retain the layout, then inspect geometry and object placement yourself. Measurements, construction decisions and real material specifications require separate verification.
Yes. Text to Image starts a new image from your description; Image to Image adds visual references. Both need a nonempty prompt, with a maximum of 20,000 characters. Fresh settings are 1K, Auto and JPG, and there is no Google Search option for this model.
No. PNG and JPG select the output file format. A PNG file does not by itself request or guarantee a transparent background; inspect the downloaded result before using it in a composite.
If checking the task is temporarily unavailable, revisit that same task rather than assuming it failed. Confirmed generation failures receive their generation credits back. A completed result with an unwanted creative change needs review and, if desired, a new request.
Make a precise request, then use the original reference to judge what the generated image changed.
