When using sdapi/v1/txt2img API to output WebP files, lossless option had been ignored

[JujoHotaru]

Hi, I'm using sdapi/v1/txt2img API to generate images. I want to use lossless webp as output format.

When using sdapi/v1/txt2img API to output WebP files, it seems that "use lossless webp" option is ignored.

in api.py, encode_pil_to_base64() function :

image.save(output_bytes, format="WEBP", exif = exif_bytes, quality=opts.jpeg_quality)

This should be like below?

image.save(output_bytes, format="WEBP", exif = exif_bytes, quality=opts.jpeg_quality, lossless=opts.webp_lossless)

[catboxanon]

PR made upstream: AUTOMATIC1111/stable-diffusion-webui#16620

I'm not sure if lllyasviel honors pulling in upstream changes anymore, so I'll manually patch it here shortly after it's merged upstream.

[JujoHotaru]

Thank you!