> ## Documentation Index > Fetch the complete documentation index at: https://docs.bfl.ml/llms.txt > Use this file to discover all available pages before exploring further. # Generate an image with FLUX.1 Fill [pro] finetune using an input image and mask. > Submits an image generation task with the FLUX.1 Fill [pro] finetune model using an input image and mask. Mask can be applied to alpha channel or submitted as a separate image. ## OpenAPI ````yaml https://api.bfl.ai/openapi.json post /v1/flux-pro-1.0-fill-finetuned openapi: 3.1.0 info: title: BFL API description: Authorize with an API key from your user profile. version: 0.0.1 servers: - url: https://api.bfl.ai description: BFL API security: [] tags: - name: Models description: >- Generation task endpoints. These endpoints allow you to submit generation tasks. - name: Utility description: >- These utility endpoints allow you to check the results of submitted tasks and to manage your finetunes. paths: /v1/flux-pro-1.0-fill-finetuned: post: tags: - Models summary: >- Generate an image with FLUX.1 Fill [pro] finetune using an input image and mask. description: >- Submits an image generation task with the FLUX.1 Fill [pro] finetune model using an input image and mask. Mask can be applied to alpha channel or submitted as a separate image. operationId: flux_pro_1_0_fill_finetuned_v1_flux_pro_1_0_fill_finetuned_post requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/FinetuneFluxProFillInputs' responses: '200': description: Successful Response content: application/json: schema: anyOf: - $ref: '#/components/schemas/AsyncResponse' - $ref: '#/components/schemas/AsyncWebhookResponse' title: >- Response Flux Pro 1 0 Fill Finetuned V1 Flux Pro 1 0 Fill Finetuned Post '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' security: - APIKeyHeader: [] servers: - url: https://api.us1.bfl.ai description: BFL Finetune API components: schemas: FinetuneFluxProFillInputs: properties: finetune_id: type: string title: Finetune Id description: >- Name of the LoRA to use. For LoRAs from other organizations (public or shared), use the format 'org-id/lora-name'. example: my-finetune finetune_strength: type: number maximum: 2 minimum: 0 title: Finetune Strength description: >- Strength of the fine-tuned model. 0.0 means no influence, 1.0 means full influence. Allowed values up to 2.0 default: 1.1 image: type: string title: Image description: >- A Base64-encoded string representing the image you wish to modify. Can contain alpha mask if desired. mask: anyOf: - type: string - type: 'null' title: Mask description: >- A Base64-encoded string representing a mask for the areas you want to modify in the image. The mask should be the same dimensions as the image and in black and white. Black areas (0%) indicate no modification, while white areas (100%) specify areas for inpainting. Optional if you provide an alpha mask in the original image. Validation: The endpoint verifies that the dimensions of the mask match the original image. prompt: type: string title: Prompt description: >- The description of the changes you want to make. This text guides the inpainting process, allowing you to specify features, styles, or modifications for the masked area. default: '' example: ein fantastisches bild steps: type: integer maximum: 50 minimum: 15 title: Steps description: Number of steps for the image generation process default: 50 example: 50 prompt_upsampling: type: boolean title: Prompt Upsampling description: >- Whether to perform upsampling on the prompt. If active, automatically modifies the prompt for more creative generation default: false seed: anyOf: - type: integer - type: 'null' title: Seed description: Optional seed for reproducibility guidance: type: number maximum: 100 minimum: 1.5 title: Guidance description: Guidance strength for the image generation process default: 60 output_format: anyOf: - $ref: '#/components/schemas/OutputFormat' - type: 'null' description: >- Output format for the generated image. Can be 'jpeg', 'png', or 'webp'. default: jpeg safety_tolerance: type: integer maximum: 6 minimum: 0 title: Safety Tolerance description: >- Tolerance level for input and output moderation. Between 0 and 6, 0 being most strict, 6 being least strict. default: 2 example: 2 webhook_url: anyOf: - type: string maxLength: 2083 minLength: 1 format: uri - type: 'null' title: Webhook Url description: URL to receive webhook notifications webhook_secret: anyOf: - type: string - type: 'null' title: Webhook Secret description: Optional secret for webhook signature verification type: object required: - finetune_id - image title: FinetuneFluxProFillInputs AsyncResponse: properties: id: type: string title: Id polling_url: type: string title: Polling Url cost: anyOf: - type: number - type: 'null' title: Cost description: Cost in credits for this request input_mp: anyOf: - type: number - type: 'null' title: Input Mp description: Input megapixels (2 decimal places) output_mp: anyOf: - type: number - type: 'null' title: Output Mp description: Output megapixels (2 decimal places) type: object required: - id - polling_url title: AsyncResponse AsyncWebhookResponse: properties: id: type: string title: Id status: type: string title: Status webhook_url: type: string title: Webhook Url cost: anyOf: - type: number - type: 'null' title: Cost description: Cost in credits for this request input_mp: anyOf: - type: number - type: 'null' title: Input Mp description: Input megapixels (2 decimal places) output_mp: anyOf: - type: number - type: 'null' title: Output Mp description: Output megapixels (2 decimal places) type: object required: - id - status - webhook_url title: AsyncWebhookResponse HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError OutputFormat: type: string enum: - jpeg - png - webp title: OutputFormat ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError securitySchemes: APIKeyHeader: type: apiKey in: header name: x-key ````