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Olympus RAW
The raw format for Micro Four Thirds photography.
ORF is the proprietary raw image format used by Olympus (now OM System) cameras. It is the standard raw format for the Micro Four Thirds system cameras produced by Olympus. ORF files contain the unprocessed data from the sensor. Because Micro Four Thirds sensors are smaller than APS-C or Full Frame, the raw data is critical for maximizing image quality, noise reduction, and dynamic range.
ORF files are TIFF-based. They store 12-bit or 14-bit sensor data. A unique feature of modern Olympus cameras is 'High Res Shot' mode, which shifts the sensor to take 8 or 16 images and merges them into a single massive raw file (up to 80 megapixels). This resulting file is still an .orf, but it contains vastly more data than a standard shot.
ORF has been used since the early Olympus E-System DSLRs. It has persisted through the transition to mirrorless PEN and OM-D series. With the rebranding to OM System, the format extension remains .orf.
Portable Gray Map
The standard uncompressed grayscale format.
PGM (Portable Gray Map) is the grayscale member of the Netpbm format family. It sits between PBM (1-bit black and white) and PPM (full color). It is designed to store grayscale images where each pixel has a value ranging from black to white, with typical depths of 8-bit (0-255) or 16-bit (0-65535).
Like other Netpbm formats, PGM has two sub-formats: P2 (ASCII) and P5 (Binary). The header defines the dimensions and the maximum gray value (Maxval). In P2, pixel values are written as plain text numbers separated by spaces. In P5, they are raw bytes. It is strictly a single-channel format.
Created by Jef Poskanzer in the late 80s to handle scanned photos that were better than 1-bit bitmaps but didn't need full color. It became a staple in computer vision research and Unix tools.
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