Raw data file or Raw image is basically the format an image takes when first taken by a camera, the image gets transformed from analogue to digital and is known as unprocessed (Raw data).
After this white balance is applied aswell as contrast, image effect, also quality and size are adjusted depending on how your camera is set up, the image is then further processed and compressed and then written to the memory card.
For an image to capture the all important hooded figure for example and then go through the above process is risking the evidence being obscured and tampered which leaves the evidence doubtful. Leaving an image in a Raw Data Format will keep any evidence fresh and untouched resulting in genuine paranormal photographs.
There are camera’s which feature the Raw Data format and can be found at any electrical store such as Jessops.