Convert 16-bit greyscale to 8-bit when saving as JPEG #7691
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stable-diffusion-webui-depthmap-script
(possibly others?) returns 16-bit greyscale images, which causes an error when saving as JPEG. This converts such images to 8-bit.8-bit greyscale JPEG derived from #6065
![depthmap-0001-L](https://user-images.githubusercontent.com/4073789/217963969-84d6f788-9f07-4232-ab97-e68d218eef9f.jpg)
Fixes #6065, closes #7616 (alternate solution)