Most cameras have the option to capture raw images, i.e. un-processed image data right from the image sensor. In theory, these images are pure physical measurements of light, and should therefore be very comparable between cameras. But are they? To investigate, I took a raw picture of a color target with each of my five cameras, and compared their output. Capturing accurate colors is a surprisingly intricate matter, as the color depends on the spectrum of the illumination, the reflective spec...
