The new release of PhotoToolbox improves performance of image processing on iPhone 4. This is not the only change in version 2.8.0: other than the new app icon, the most important addition is the introduction of a layer blend feature.
Blending can be enabled by scrolling the first menu wheel in Filter mode. There are 6 presets for quick blending; however, by tapping on the Blend button, you can access the blend editor and import any image in JPG and PNG format from your own device. This lets you use custom textures and allows to merge more photos together.
There are 16 classic blending modes available in all: Normal, Multiply, Screen, Darken, Lighten, Overlay, Soft Light, Hard Light, Color Burn, Color Dodge, Difference, Exclusion, Hue, Saturation, Color, Luminosity. For each mode, it’s possible to set overall intensity.
Imported textures or images can be resized according to different aspect ratios and they can also be rotated independently from the base photo you want to apply them to. Using the Front/Back switch, the order of the layers can be inverted.
Custom blends you create can be saved among the app’s presets.