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JPEG 2000 Code Stream
Yet another extension for raw JPEG 2000 streams.
JPC is another file extension used for JPEG 2000 codestreams. It is synonymous with J2C and J2K, representing the raw compressed data without the JP2 container.
Identical to J2C and J2K. The extension 'JPC' is less common but supported by libraries like ImageMagick and OpenJPEG.
Part of the JPEG 2000 standard. The proliferation of extensions (jpc, j2k, j2c) stems from early committee drafts and specific software implementation preferences.
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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