ill be converted to a single
channel (luminance) before use. If it’s a tensor, it should contain one color channel (L) instead of 3,
so the expected shape would be (B, H, W, 1).   negative_prompt (str or List[str], optional) —
The prompt or prompts not to guide the image generation. Ignored when not using guidance (i.e., ignored
if guidance_scale is less than 1).   num_images_per_prompt (int, optional, defaults to 1) —
The number of images to g