Merge pull request #4173 from evshiron/fix/encode-pnginfo

from modules.processing import StableDiffusionProcessingTxt2Img, StableDiffusionProcessingImg2Img, process_images

from modules.sd_samplers import all_samplers

from modules.extras import run_extras, run_pnginfo

from PIL import PngImagePlugin

from modules.sd_models import checkpoints_list

from modules.realesrgan_model import get_realesrgan_models

from typing import List

def encode_pil_to_base64(image):

    buffer = io.BytesIO()

    image.save(buffer, format="png")

    return base64.b64encode(buffer.getvalue())

    with io.BytesIO() as output_bytes:

        # Copy any text-only metadata

        use_metadata = False

        metadata = PngImagePlugin.PngInfo()

        for key, value in image.info.items():

            if isinstance(key, str) and isinstance(value, str):

                metadata.add_text(key, value)

                use_metadata = True

        image.save(

            output_bytes, "PNG", pnginfo=(metadata if use_metadata else None)

        )

        bytes_data = output_bytes.getvalue()

    return base64.b64encode(bytes_data)

class Api: