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Epson RAW
The raw format for the cult classic Epson R-D1.
ERF is the raw format used by the Epson R-D1, the world's first digital rangefinder camera. Released in 2004, the R-D1 is a cult classic among camera enthusiasts for its analog handling (it even has a film advance lever to cock the shutter). ERF files contain the raw data from the camera's 6-megapixel CCD sensor.
ERF is a TIFF-based raw format. It is relatively simple compared to modern formats, storing 12-bit data.
Epson only made one digital camera line (R-D1, R-D1s, R-D1x). The format died with the discontinuation of the R-D1x in 2014.
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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