How to convert TIFF black and white color?

I have 11 items on an iMac with OS X 10.7.5 (Lion). I want to convert a black and white TIFF image, but when I click on improve the option convert to black and white on the menu that follows is grayed out. Is there a way to do this or do I have to convert TIFF to JPEG before I can convert color to black and white?

Your solution worked! Thank you for the necessary reminder that there are still some actions that are not items on 16-bit images.

Tags: Photoshop

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