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ERF is a graphic file extension that is regularly used to represent the images captured by the latest Epson digital cameras. Since ERF images are unprocessed, users will not be able to print and adjust them before having converted them to other formats.
Similar to other RAW formats, the data stored by ERF images is exactly as it has been captured by the camera's sensor.
In order to be able to access ERF images, users will need to find a graphic viewer that supports the format.