Using your Topaz Labs plug-ins with Capture One is easy. Unlike Photoshop, where a plug-in is 'invoked' from a plug-ins menu, Capture One allows you to send your images to an external editor to be edited and saved.
To use your Topaz Labs product with Capture One, click "Image>Edit With..."
If you haven't sent an image to your Topaz Labs plug-in yet, it probably won't show up here. No problem, just click "Other..."
Now just find the plug-in you would like to use in your applications folder:
Finally, Capture One will ask you how you would like to export the image to your Topaz plug-in. Once you've made your choices, click "Edit Variants"
Once you've finished making your edits in your Topaz Labs application, just save the image and Capture One to continue your workflow.