The technique for reading data from images has changed in openFrameworks, and the included examples have not yet caught up with this (as of v.0.9.8). With the help of Alex van Giersbergen and Sourya Sen, we’ve prepared an example to illustrate this, which can be dowloaded here:
pixelsTest
Sourya also recommends this related blog post: https://processing.org/tutorials/pixels/
To use the camera (for example to run the ImagePicker or VideoGrabber examples) you will need to update the ofxiOS-Info.plist by right-clicking in an empty area, add lines and then pick Privacy-Camera… and/or Privacy – Photo Library… and add any text there (thanks Gurden Batra).
