The day has finally come. Capture One users can finally use the XRite ColorChecker to create camera profiles and get proper true-to-life colors in our photos. The necessity for a proper color workflow is imperative for anything you plan on printing, or duplicating in any way (Especially when working with brands).
First off, a disclaimer. As of the 8th of January 2019 this current version of the ColorChecker software, 1.2, is in public beta so you may experience a hiccup or two but so far I have yet to experience any. The video that XRite released is a little light on the details for how to use the ColorChecker, but you can watch that here. (Dear XRite, simply saying "use the recommended settings" does not tell people how to do something!)
In order to make an ICC profile for the specific lighting setup of a shoot, let's say a product shoot, get all of your settings and lighting dialed in, and then take a photo of the ColorChecker before continuing with your photoshoot. Once done, import your files into Capture One and select the file with the ColorChecker. Next, set the ICC profile to "No Color Correction" under Base Characteristics -> ICC Profile -> Effects. You may have to hit "Show All" to see this.
In the dialogue box directly below ICC Profile, set your curve to "Linear Response" and you are ready to export! When exporting, you want to be sure to use a 16 Bit Uncompressed TIFF File, with the ICC Profile set to "Embed Camera Profile". Now quit Capture One and open the ColorChecker Passport software. On the top right, click the button called ICC, and then drag and drop the TIFF file you created into the program and press "Create Profile". If you are using windows, there is currently a bug where files large than 150MB will not work so you may need to crop your photo for this. After the software has made the ICC profile, it will automatically open to the proper folder so you can easily save it there. Re-Open Capture One and you will find your new ICC profile under the "Other" drop-down. If you are tethering, continue shooting, if you're in post-production, you can now copy-paste these settings to every image and get to work!