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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.
Microsoft Windows Cursor
The standard format for static mouse cursors on Microsoft Windows.
The CUR format is the standard file format for static mouse cursors in the Microsoft Windows operating system. It is structurally almost identical to the ICO (Icon) format, with one key difference: the header contains a defined 'hotspot'. The hotspot specifies the exact pixel coordinate (x, y) that registers the click, such as the tip of an arrow pointer.
A CUR file starts with a header similar to an ICO file, but the 'image type' field is set to 2 (Cursor) instead of 1 (Icon). For each image in the file (it can contain multiple sizes/depths), the directory entry stores the hotspot X and Y coordinates instead of the color planes/bpp fields found in ICOs. The image data itself is typically a BMP with a 1-bit AND mask for transparency, or a PNG in modern versions.
Introduced with Windows 1.0, the format has evolved alongside Windows. Originally supporting only monochrome, it grew to support 16 colors, 256 colors, and finally 32-bit alpha-blended cursors in Windows XP.
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