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OK... Dunno what I'm missing, but something strange is happening in PS...

I've done quite a bit of work on an image in PS using a couple of layers. I've saved it as a PSD file... I then flattened the image, resized it for the web, applied sharpening, but it won't let me set the mode to be 8-bit, so I can't save it as a JPG...

What totally obvious thing am I missing???

It's not in some strange colour mode is it - eg if it's multi channel you can't change to 8 bit

Nope... RGB color
the 8-bit mode option is greyed out and the 32-bit is available...

I can probably save it with Save for Web, but I'm just curious what I've done... this is the first time I've used layers for a while, so it's probably something to do with that...