Control Points are a way to selectively apply filter effects in Color Efex Pro 4. Control points are particularly useful because they are essentially content-aware masks. This article describes how to use them.
Aperture’s control sliders have remained mostly unchanged since the release of Aperture 3 (although the upcoming Photos app is likely to offer a significant modernization). One way to make more sophisticated adjustments to an image’s color and contrast is through the use of plugins. In this article, I will provide an introduction to Color Efex Pro 4, one of my favorites.
When using the Google Nik Collection plug-ins in Aperture 3.5 or 3.5.1 on Mavericks, you may experienced the “grey screen of death”, where your image no longer appears in the viewer. If that’s happening to you, try this workaround.