While working on a photo in ColorSplash, I noticed that they are supporting cross app movement of the image.
A group of iPhone photo apps are using a common method of coding that gives you the ability to edit an image in one app and share it directly with another app to continue editing. You do not need to save the image from one app to the iPhone’s Photo Library then open it with another app to continue editing. From the apps’ Share option, choose to share the image with another app. You will then be presented with a list of apps on your iPhone that support the direct movement of photos between editors. I would expect the list to grow as other developers add the free feature.