The Raspberry Pi Foundation recently released an interchangeable lens camera module based on the Sony IMX477, a 1/2.3″ back side illuminated sensor with 3040×4056 pixels of 1.55um pitch. In this somewhat technical article we will unpack the 12-bit raw still data that it produces and render it in a convenient color space.
Continue reading Opening Raspberry Pi High Quality Camera Raw Files
A spectrogram, also sometimes referred to as a periodogram, is a visual representation of the Power Spectrum of a signal. Power Spectrum answers the question “How much power is contained in the frequency components of the signal”. In digital photography a Power Spectrum can show the relative strength of repeating patterns in captures and whether processing has been applied.
In this article I will describe how you can construct a spectrogram and how to interpret it, using dark field raw images taken with the lens cap on as an example. This can tell us much about the performance of our imaging devices in the darkest shadows and how well tuned their sensors are there.
