Uninstalling Capture One on a Mac

An updated post has been written for Mac OS X 10.7 and 10.8, find that here.

When upgrading to a newer Capture One software, we recommend that you do a clean uninstall and then install the latest version Capture One version.

Note: If you’re a Windows user see this link for Phase One Article on uninstalling C1 in Windows..

1. Deactivate Capture One so that the activation will be free to use on another computer or on the same computer with new hardware. This can be done by navigating to [Capture One>License]. Choose a computer to deactivate it from. Click Deactivate. Note: this step is not needed if you are running Capture One using the “Digital Back Only” or “Capture One DB” option.

2. Quit Capture One (if running)

3. Drag the application to the trash:

  • HD>Applications>Capture One

4. Delete the Library file located here:

  • Mac HD>User>Pictures>Capture one Library>Capture One.col (capture One.col45 with version 4 and .col50 with version 5)

5. Delete the Preference files located here:

  • User>Library>Preferences>com.phaseone.captureone.plist
  • User>Library>Preferences>com.phaseone.captureone.LSSharedFileList

6. Delete the Application Support folders… Delete the Entire capture One directory.

  • User>Library>Application Support>Capture One

Reset Capture One (Standard) on a Mac

Note: If you’re a Windows user see this link for Phase One Article on uninstalling C1 in Windows..
If you are experiencing issues with Capture One such as crashes, freezes, strange cursor behavior, or other abnormalities they may be resolved by resetting Capture One. To do this simply close Capture One, delete the folders/files listed below, empty the trash, and restart Capture One. This will, by definition, reset all preferences, presets, and user settings to default.

  • [User] > Library > Application Support > Capture One
  • [User] > Library > Preferences > com.phaseone.[anything]
  • [User] > Pictures > Capture One Default Session > Capture One.col
  • [User] > Pictures > Capture One Library > Capture One.col
  • [HD] > Library > Application Support > Capture One

Note: that if you need to maintain specific files such as LCC files you can move them out of their specific subfolder prior to uninstall Capture One and, after uninstalling/reinstalling, place them back into the appropriate subfolder.

Note: there may be 1, 2, or 3 files that begin with “com.phaseone” in the Preferences Folder. However many there are, delete all of them.

Note: the [User] folder is the one with the house icon. It is also called your “home” folder. See below.

One way to access your “home” folder (aka “user” folder)

The Last Thing to Try

The following is a major step which should not be taken lightly. The first time Capture One looks at a particular file it creates proxy/cache and focus mask files for that file. Doing this for a folder of several hundred images can take many minutes. By deleting these files some strange issues, such as scrambled or miscolored previews, or crashes that happen when viewing only a particular image or image folder, can be resolved. However following this step Capture One will have to rebuild the proxy/cache and focus mask files of any folder of images when you first navigate to that folder.

Delete Proxys and Focus Mask Files

1) In the Finder Select File-Find

2) Push the plus button to add a search critera

3) Search for Name – Ends With – “.cop” (later you can search for .cof which corresponds to focus mask files in capture one 5 and after)

4) Double and then triple check that you are searching only for files ending with .cop. If you’re not 100% sure all listed files are .cop files then stop and do nothing

5) Select All and Delete


You may also wish to delete the entire folder “Capture One Library” rather than just the .col45 or .col50 file. Before doing this, make sure no important raw or processed files are in the “captures”, “trash” and “output” folders therein. Don’t blame us if you delete raw files!