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Hasselblad 3FR
The raw format for Hasselblad's legendary medium format cameras.
3FR is the proprietary raw image format used by Hasselblad cameras. It is designed to capture the immense amount of data produced by medium format sensors, which are significantly larger than full-frame sensors. 3FR files are compressed to save space on the memory card. When imported into Hasselblad's Phocus software (or other compatible editors), they are typically converted into the uncompressed FFF format for editing.
3FR files contain 16-bit sensor data. This high bit depth is crucial for medium format photography, which prioritizes color accuracy and tonal gradation above all else. The format is TIFF-based but heavily customized. It includes specific metadata for Hasselblad's lens corrections (DAC - Digital Auto Correction), which are essential for achieving the optical perfection the brand is known for.
Hasselblad introduced 3FR with their H-system digital backs. It remains the standard capture format for their H and X system cameras.
Icon File
A generic, often ambiguous extension for icon resources.
The `.icon` file extension is a generic identifier for icon images. Unlike the strictly defined `.ico` (Windows Icon), `.icon` is often used in Unix/Linux environments or by tools like ImageMagick as a catch-all alias for various icon formats (including Sun Icon, XBM, or simply renamed ICO files). It is not a standardized format itself but a convention for naming icon resources.
The internal structure of an `.icon` file depends entirely on what created it. It might be a standard Microsoft ICO container with multiple sizes and color depths. It might be a persistent X11 bitmap (XPM). Or it might be a Sun Raster file used for icons on Solaris systems. Because of this ambiguity, it requires a robust viewer that detects format by 'magic bytes' rather than extension.
In the early days of GUI desktops (SunOS, IRIX, early X11), there wasn't a single unified icon standard like Windows .ico. The `.icon` extension served as a descriptive label for files intended to be used as desktop icons, regardless of their underlying binary format.
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