When I put a formatted SD card in my E-P1, the display shows a capacity of RAW files that doesn appear to be accurate. Why?
When the E-P1 saves a captured image as digital data and writes it onto the memory card, it performs complex mathematical calculations to convert the image into binary code data to be saved and later retrieved. Since images are unique, each calculation is unique. The manual for the E-P1 shows that a RAW file is approximately 14 megabytes. However, since the factors comprising each image are unique, each calculation is unique and the results of the calculation will vary. The E-P1 writes a lossless RAW file, and one of the ways it does this is by sampling some of the factors in the image. A winter landscape consisting of predominantly white snow and blue sky will produce a smaller data file than a scene such as Times Square at night. The richness of the latter scene will result in a larger file. When the E-P1 polls a formatted SD card, it is looking at a blank slate. It has yet to do the math for any images and is programmed to start out with a conservative capacity estimate. As the came
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