In the previous section, we glossed over one of the important technical details so that we could simplify the explanation of color. You've learned that light is converted to electrical charge, but the electrical charges that build up in the CCD are not digital signals that are ready to be used by your computer.
Interpolation is handled by a microprocessor after the data has been digitized.
The whole process Think of each photosite as a bucket or a well. Now think of the photons of light as raindrops. Some buckets have more water and some buckets have less water, representing brighter and darker sections of the image. Keeping to the analogy, the ADC measures the depth of the water, which is considered analog information. Then it converts that information to binary form.