How to preserve color version of image in Aperture before editing in Silver Efex Pro 2
How do I preserve my layers and or my CMYK color space when using Silver Efex Pro 2 in Aperture?
To preserve any information created in an external editor such as layers or a non-RGB color space, please use "Edit a Copy With" and then select Silver Efex Pro 2. To access "Edit a Copy With" simply hold down the option key on your keyboard and then access the Images menu and select "Edit a Copy With". This will create a new version of the previous version that was already altered in an external editor.