Instagram is one of the most popular image filter and sharing apps for mobile devices but its feature set has remained almost unchanged since it was introduced, with a relatively small number of effects, and little control over them. The latest version 6 update to the Android and iOS versions of Instagram now offers control over filter strength and a range of new editing options, including brightness, contrast, warmth, saturation, highlights, shadows and vignette. Click through to read more at connect.dpreview.com