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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.
Microsoft Icon
The standard format for icons on Microsoft Windows and the web (favicons).
The ICO format is a container for one or more images at multiple sizes and color depths. It allows a single file to store appropriate icons for different display contexts (e.g., 16x16 for menus, 256x256 for desktop). It supports transparency and, in modern versions, PNG compression.
ICO files contain a header followed by an icon directory that lists each image entry. Each entry can use either BMP (uncompressed) or PNG compression. The format supports 1, 4, 8, 16, 24, and 32-bit color depths with optional alpha channels.
Introduced with Microsoft Windows 1.0. It became the standard for website favicons with the release of Internet Explorer 5.
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