LearnLight is a science app for visible light analysis. It allows you to compare two spectral image files to graph the intensity, transmittance, and absorbance of their visible light wavelengths.
Note!!!!!!: There is a startup crash in Android 4.4 I am looking at. Sorry for this, introduced by...
Learn Light Spectrometry — This is a really neat app that allows you to compare intensity, transmittance and absorbance of visible light between any two images. Start with examples provided before you choose your own images to grasp the app fully. Recommend!