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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.
BigTIFF
TIFF for files larger than 4GB.
BigTIFF (often referred to as TIFF64) is an extension of the classic TIFF format designed to break the 4GB file size barrier. It uses 64-bit offsets instead of 32-bit, allowing for files up to 18,000 petabytes.
Standard TIFF uses 32-bit integers for file offsets, limiting the file size to 2^32 bytes (4GB). BigTIFF changes the internal structure to use 64-bit integers. It is not backward compatible with older TIFF readers that only understand 32-bit offsets.
Developed to address the needs of geospatial and medical imaging, where single images often exceed 4GB. It is supported by LibTIFF starting from version 4.0.
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