app.py

import gradio as gr
import spaces
import os
import sys
import subprocess
import numpy as np
from PIL import Image
import cv2

from huggingface_hub import login
hf_token = os.environ.get("HF_TOKEN_GATED")
login(token=hf_token)

import torch
from diffusers.utils import load_image
from diffusers.pipelines.flux.pipeline_flux_controlnet import FluxControlNetPipeline
from diffusers.models.controlnet_flux import FluxControlNetModel

base_model = 'black-forest-labs/FLUX.1-dev'
controlnet_model = 'InstantX/FLUX.1-dev-Controlnet-Canny-alpha'
controlnet = FluxControlNetModel.from_pretrained(controlnet_model, torch_dtype=torch.bfloat16)
pipe = FluxControlNetPipeline.from_pretrained(base_model, controlnet=controlnet, torch_dtype=torch.bfloat16)
# pipe.enable_model_cpu_offload()
pipe.to("cuda")

def resize_image(input_path, output_path, target_height):
    # Open the input image
    img = Image.open(input_path)

    # Calculate the aspect ratio of the original image
    original_width, original_height = img.size
    original_aspect_ratio = original_width / original_height

    # Calculate the new width while maintaining the aspect ratio and the target height
    new_width = int(target_height * original_aspect_ratio)

    # Resize the image while maintaining the aspect ratio and fixing the height
    img = img.resize((new_width, target_height), Image.LANCZOS)

    # Save the resized image
    img.save(output_path)

    return output_path, new_width, target_height


@spaces.GPU()
def infer(image_in, prompt, inference_steps, guidance_scale, control_weight, progress=gr.Progress(track_tqdm=True)):
    

    n_prompt = 'NSFW, nude, naked, porn, ugly'

    # Canny preprocessing
    image_to_canny = load_image(image_in)
    image_to_canny = np.array(image_to_canny)
    image_to_canny = cv2.Canny(image_to_canny, 100, 200)
    image_to_canny = image_to_canny[:, :, None]
    image_to_canny = np.concatenate([image_to_canny, image_to_canny, image_to_canny], axis=2)
    image_to_canny = Image.fromarray(image_to_canny)

    control_image = image_to_canny
 
    # infer
    image = pipe(
        prompt=prompt,
        #negative_prompt=n_prompt,
        control_image=control_image, 
        controlnet_conditioning_scale=control_weight,
        num_inference_steps=inference_steps,
        guidance_scale=guidance_scale,
    ).images[0]

    
    image_redim, w, h = resize_image(image_in, "resized_input.jpg", 512)
    image = image.resize((w, h), Image.LANCZOS)
    
    return image, gr.update(value=image_to_canny, visible=True)
   

css="""
#col-container{
    margin: 0 auto;
    max-width: 1080px;
}
"""
with gr.Blocks(css=css) as demo:
    with gr.Column(elem_id="col-container"):
        gr.Markdown("""
        # FLUX.1-dev Controlnet
        Experiment with FLUX.1-dev ControlNet Canny model proposed and maintained by the InstantX team.<br />
        Model card: [InstantX/FLUX.1-dev-Controlnet-Canny-alpha](https://huggingface.co/InstantX/FLUX.1-dev-Controlnet-Canny-alpha)
        """)
        
        with gr.Column():
            
            with gr.Row():
                with gr.Column():
                    image_in = gr.Image(label="Image reference", sources=["upload"], type="filepath")
                    prompt = gr.Textbox(label="Prompt")
                    
                    with gr.Accordion("Advanced settings", open=False):
                        with gr.Column():
                            with gr.Row():
                                inference_steps = gr.Slider(label="Inference steps", minimum=1, maximum=50, step=1, value=25)
                                guidance_scale = gr.Slider(label="Guidance scale", minimum=1.0, maximum=10.0, step=0.1, value=7.0)
                            control_weight = gr.Slider(label="Control Weight", minimum=0.0, maximum=1.0, step=0.01, value=0.7)
                    
                    submit_canny_btn = gr.Button("Submit")
                    
                with gr.Column():
                    result = gr.Image(label="Result")
                    canny_used = gr.Image(label="Preprocessed Canny", visible=False)
                    


    submit_canny_btn.click(
        fn = infer,
        inputs = [image_in, prompt, inference_steps, guidance_scale, control_weight],
        outputs = [result, canny_used],
        show_api=False
    )
demo.queue().launch()