SRF to PPM Converter

SRF (Sony RAW Format) is the earliest proprietary RAW image format used by Sony digital cameras, introduced in 2003 with the Cyber-shot DSC-F828 and also used by the DSC-V3 compact camera. SRF files capture the unprocessed sensor readout at 12 bits per channel, preserving the raw Bayer-pattern data from the camera's CCD sensor before any demosaicing, white balance, or compression processing. The DSC-F828 was notable for its unique 4-color RGBE (Red, Green, Blue, Emerald) CCD sensor design — an attempt to capture a wider color gamut by adding a cyan-shifted fourth color filter element — and SRF files from this camera store the raw 4-color mosaic data needed to take advantage of this unconventional sensor layout. The format uses a proprietary container structure with Sony-specific metadata tags recording exposure parameters, lens position, and camera settings. SRF was succeeded by SR2 and then ARW as Sony expanded into interchangeable-lens cameras with the Alpha DSLR system from 2006 onward. One advantage is the capture of data from genuinely innovative sensor technology — the DSC-F828's 4-color filter array was a unique experiment in consumer camera design, and SRF files preserve the raw 4-channel data that enables exploration of the extended color gamut this sensor design was intended to provide, particularly in the cyan-green portion of the spectrum where standard Bayer sensors have gaps. Despite the format's obscurity, SRF files remain processable: Adobe Camera Raw, dcraw, LibRaw, and RawTherapee all support SRF, ensuring these early Sony RAW files remain accessible for modern processing.