Stable Diffusion web UI txt2img img2img api example script

sd-webui-txt2img-img2img-api-example.py

from datetime import datetime
import urllib.request
import base64
import json
import time
import os

webui_server_url = 'http://127.0.0.1:7860'

out_dir = 'api_out'
out_dir_t2i = os.path.join(out_dir, 'txt2img')
out_dir_i2i = os.path.join(out_dir, 'img2img')
os.makedirs(out_dir_t2i, exist_ok=True)
os.makedirs(out_dir_i2i, exist_ok=True)


def timestamp():
    return datetime.fromtimestamp(time.time()).strftime("%Y%m%d-%H%M%S")


def encode_file_to_base64(path):
    with open(path, 'rb') as file:
        return base64.b64encode(file.read()).decode('utf-8')


def decode_and_save_base64(base64_str, save_path):
    with open(save_path, "wb") as file:
        file.write(base64.b64decode(base64_str))


def call_api(api_endpoint, **payload):
    data = json.dumps(payload).encode('utf-8')
    request = urllib.request.Request(
        f'{webui_server_url}/{api_endpoint}',
        headers={'Content-Type': 'application/json'},
        data=data,
    )
    response = urllib.request.urlopen(request)
    return json.loads(response.read().decode('utf-8'))


def call_txt2img_api(**payload):
    response = call_api('sdapi/v1/txt2img', **payload)
    for index, image in enumerate(response.get('images')):
        save_path = os.path.join(out_dir_t2i, f'txt2img-{timestamp()}-{index}.png')
        decode_and_save_base64(image, save_path)


def call_img2img_api(**payload):
    response = call_api('sdapi/v1/img2img', **payload)
    for index, image in enumerate(response.get('images')):
        save_path = os.path.join(out_dir_i2i, f'img2img-{timestamp()}-{index}.png')
        decode_and_save_base64(image, save_path)


if __name__ == '__main__':
    payload = {
        "prompt": "masterpiece, (best quality:1.1), 1girl <lora:lora_model:1>",  # extra networks also in prompts
        "negative_prompt": "",
        "seed": 1,
        "steps": 20,
        "width": 512,
        "height": 512,
        "cfg_scale": 7,
        "sampler_name": "DPM++ 2M",
        "n_iter": 1,
        "batch_size": 1,

        # example args for x/y/z plot
        # "script_name": "x/y/z plot",
        # "script_args": [
        #     1,
        #     "10,20",
        #     [],
        #     0,
        #     "",
        #     [],
        #     0,
        #     "",
        #     [],
        #     True,
        #     True,
        #     False,
        #     False,
        #     0,
        #     False
        # ],

        # example args for Refiner and ControlNet
        # "alwayson_scripts": {
        #     "ControlNet": {
        #         "args": [
        #             {
        #                 "batch_images": "",
        #                 "control_mode": "Balanced",
        #                 "enabled": True,
        #                 "guidance_end": 1,
        #                 "guidance_start": 0,
        #                 "image": {
        #                     "image": encode_file_to_base64(r"B:\path\to\control\img.png"),
        #                     "mask": None  # base64, None when not need
        #                 },
        #                 "input_mode": "simple",
        #                 "is_ui": True,
        #                 "loopback": False,
        #                 "low_vram": False,
        #                 "model": "control_v11p_sd15_canny [d14c016b]",
        #                 "module": "canny",
        #                 "output_dir": "",
        #                 "pixel_perfect": False,
        #                 "processor_res": 512,
        #                 "resize_mode": "Crop and Resize",
        #                 "threshold_a": 100,
        #                 "threshold_b": 200,
        #                 "weight": 1
        #             }
        #         ]
        #     },
        #     "Refiner": {
        #         "args": [
        #             True,
        #             "sd_xl_refiner_1.0",
        #             0.5
        #         ]
        #     }
        # },
        # "enable_hr": True,
        # "hr_upscaler": "R-ESRGAN 4x+ Anime6B",
        # "hr_scale": 2,
        # "denoising_strength": 0.5,
        # "styles": ['style 1', 'style 2'],
        # "override_settings": {
        #     'sd_model_checkpoint': "sd_xl_base_1.0",  # this can use to switch sd model
        # },
    }
    call_txt2img_api(**payload)

    init_images = [
        encode_file_to_base64(r"B:\path\to\img_1.png"),
        # encode_file_to_base64(r"B:\path\to\img_2.png"),
        # "https://image.can/also/be/a/http/url.png",
    ]

    batch_size = 2
    payload = {
        "prompt": "1girl, blue hair",
        "seed": 1,
        "steps": 20,
        "width": 512,
        "height": 512,
        "denoising_strength": 0.5,
        "n_iter": 1,
        "init_images": init_images,
        "batch_size": batch_size if len(init_images) == 1 else len(init_images),
        # "mask": encode_file_to_base64(r"B:\path\to\mask.png")
    }
    # if len(init_images) > 1 then batch_size should be == len(init_images)
    # else if len(init_images) == 1 then batch_size can be any value int >= 1
    call_img2img_api(**payload)

    # there exist a useful extension that allows converting of webui calls to api payload
    # particularly useful when you wish setup arguments of extensions and scripts
    # https://github.com/huchenlei/sd-webui-api-payload-display

You would use prompts from a file for a program that already has descriptions of images ready to be created for the user, for example, an on-the-fly dungeon crawler game. The point of an API is that it allows for divergent use, allowing you to apply entirely different interfaces and use cases to SD, it's not always about "write description, create image."

Hi. Thanks for your great contributions and tutorials. Do you have example payloads for processing multiple images, each with different prompts (batch processing)? I noticed that each sample takes around 10 seconds, and each run takes 3GB of RAM at max. My GPU has 24GB of RAM and I wanna exploit batch processing for higher throughputs. I tried the txt2img API but it only handles 1 request at a time despite receiving many at the same time. I wonder if batch processing is possible or not? Or I have to implement some task processing scheduler such as Celery and use multiple workers at the same time ?

@mack

You would use prompts from a file for a program that already has descriptions of images ready to be created for the user, for example, an on-the-fly dungeon crawler game. The point of an API is that it allows for divergent use, allowing you to apply entirely different interfaces and use cases to SD, it's not always about "write description, create image."

you misunderstood what he's asking what he's asking, he's asking about the parameters to use for the Prompts from file or textbox script a buit-in script similer to XYZ grid
basically the function of the script is to let user generate multiple images with different parameters, parameters such as prompts samplers sd model
I don't see a use case of this when using this script when using webui via API, Prompts from file or textbox, only gives you control of a handful of different parameters, while if you use API directly you have control over everything including parameters of extensions, using Prompts from file or textbox only adds an extra layer of complexity while giving you less control

he is not asking about reading prompts from a predetermined file/preset/configuration/template
he's asking about a script

@vincent-dl

Hi. Thanks for your great contributions and tutorials. Do you have example payloads for processing multiple images, each with different prompts (batch processing)? I noticed that each sample takes around 10 seconds, and each run takes 3GB of RAM at max. My GPU has 24GB of RAM and I wanna exploit batch processing for higher throughputs. I tried the txt2img API but it only handles 1 request at a time despite receiving many at the same time. I wonder if batch processing is possible or not? Or I have to implement some task processing scheduler such as Celery and use multiple workers at the same time ?

first you have to understand that there is a difference between batch processing and processing two jobs at once
and with batch processing there's two types of batches batch size and batch count
batch_size is how many images it will process in parallel, using the exact same parameters
(batch count) or in api n_iter is running multiple times for increasing the seed

processing multiple jobs at once it's not supported by webui
lots of parts of the code are only designed for you to only have one job being processed at a time
such as we allows a job to request switching of the current model

just think what chaos what happened if the model is unloaded doing one job by another job

if you really want to do so you could launch multiple instances of webui server, but it doesn't really make much sense doing so on single GPU system
in general when generating "normal size images" your GPU core utilization is basically already at Max
the bottleneck is the processing not the VRAM

while setting a batch size of batch count could reduce job some overhead
it is unlikely that you will see a big performance difference if you use a bigger batch size

but you have multiple GPUs then it may make sense
you just have to distribute it your request among your werbui instances
or use an extension that chains multiple webui toughter https://github.com/papuSpartan/stable-diffusion-webui-distributed

I answered a similar question just recently regarding performance AUTOMATIC1111/stable-diffusion-webui#14784 (comment)

@w-e-w thanks for your response

Hello, I would like to ask what the parameters for redrawing the area are. I would like to use redrawing only to mask the area, but it has not taken effect and has been redrawing the entire image

Hello, I would like to ask what the parameters for redrawing the area are. I would like to use redrawing only to mask the area, but it has not taken effect and has been redrawing the entire image

are you asking about Inpaint area only masked
irrc the payload are is inpaint_full_res: True

Is it possible to add Adetailer to the payload

Is it possible to add Adetailer to the payload

yes read the last section

Hi, trying it out on 19th April on Windows 11, Python 3.10.11 and I'm getting a HTTP Error 404: Not Found running the above example script. However when I use the requests module instead of urllib I can get the correct response.
Letting people know in case someone faces a similar issue

Hi, trying it out on 19th April on Windows 11, Python 3.10.11 and I'm getting a HTTP Error 404: Not Found running the above example script. However when I use the requests module instead of urllib I can get the correct response. Letting people know in case someone faces a similar issue

hey, can you share your updated code

Hi, trying it out on 19th April on Windows 11, Python 3.10.11 and I'm getting a HTTP Error 404: Not Found running the above example script. However when I use the requests module instead of urllib I can get the correct response. Letting people know in case someone faces a similar issue

Hi, I used requests but still got empty response object showing 404. Could you share you code here? Many thanks.

@ckc1q2w

Hello, you have shown an example args for 'x/y/z plot' in this demo, May I ask if you can give me an example args for 'Prompts from file and textbox'

https://gist.github.com/w-e-w/0f37c04c18e14e4ee1482df5c4eb9f53#file-sd-webui-txt2img-img2img-api-example-py-L161-L163

but to be honest I don't know why you would ever use Prompts from file and textbox in api just used API and send multiple requests to generate the images with the parameters you want, you have more freedom

Hi, this script is not working anymore. Possible updates?

When I make request at http://127.0.0.1:7860/sdapi/v1/txt2img directly using postman or using the above script (with or without requests module) I am getting 404 error. Anyone know how to fix this?

Did they remove the txt2img & img2img APIs? Please anyone gives us confirmation, thanks.

Did they remove the txt2img & img2img APIs? Please anyone gives us confirmation, thanks.

api works

---

... HTTP Error 404: Not Found ...

the API error message is not that descripted, we use 404 for lots of things "not found"

txt2img and img2img

• Sampler not found
  img2img
• Init image not found
  interrogate
• Image not found
• Model not found

---

in particular there was some change to the sampler scheduler in 1.9
we did not have the foresight to implement backwards compatibility and result in a 404 if you try to generate an image with a non-existent sampler scheduler

• AUTOMATIC1111/stable-diffusion-webui#15656
• AUTOMATIC1111/stable-diffusion-webui#15681

@w-e-w
I created a request using Postman and it says "Not found". Can you tell me what is wrong here?

Moreover, at "http://127.0.0.1:7860/docs#/" I cannot see the description for that above 2 APIs. I installed Automatic1111 v1.9.3

Moreover, at "http://127.0.0.1:7860/docs#/" I cannot see the description for that above 2 APIs. I installed Automatic1111 v1.9.3

that's odd, it's showing on mine

but since you give me practically zero information I can't really help
if I think your experiencing an issue don't ask here make an issue post