I want to imitate Photoshop layer 'soft light' blending in iOS

Question

In Photoshop a layer can be blended with a layer below it using many different ways, ie Normal, Dissolve, Darken, Soft Light, etc. I would like to duplicate this effect programmatically in iOS using the core graphics api. Any ideas?

Answer 1

您不能在CALayers之间应用不同的混合模式（至少在iOS上），但如果您正在实现-drawRect：或以其他方式创建图像，您当然可以使用与kCGBlendModeSoftLight CoreGraphics混合模式的柔和光混合。

Answer 2

There is an example of layer blending in iOS using Core Graphics in the project I just posted here: https://github.com/esilverberg/ios-image-filters

I only implemented overlay blending so far.