I have received a request to edit a picture with the Nik Collection and MAC Photos. I chose a night photo so I can explain how to play with the white balance and change the exposure in Photos. Then I will go to the Nik Collection to sharpen and de noise the photo. I will quickly touch on how to had some effect to your image using Color Effect Pro.
Here is how you can create a .JPEG image from your RAW file in MAC Photos. Click on the RAW photo you want to convert. Once selected go to File in the top menu and choose Export, the shortcut is shift+command+E. Then a menu will appear asking you details on your export. Choose these settings: Photo Kind: JPEG, JPEG Quality: Maximum, Size: Full Size. Then click Export and choose a desire location for the new file. After you will need to import your new .JPEG image to MAC Photos.