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Grok is a computer software library to encode and decode images in the JPEG 2000 format. It is designed for stability, high performance, and low memory usage. Grok is free and open-source software released under the GNU Affero General Public License (AGPL) version 3.
In addition to the eponymous codec library, it packages a suite of auxiliary tools, like the command line encoder cjxl and decoder djxl, the fast lossless-only encoder fjxl, the image codec benchmarking tool (speed, quality) benchmark_xl, as well as the GIMP and gdk-pixbuf plugin file-jxl. As of 2023 (v0.9.0) it also offers Google's jpegli, an ...
Base64 is particularly prevalent on the World Wide Web [1] where one of its uses is the ability to embed image files or other binary assets inside textual assets such as HTML and CSS files. [2] Base64 is also widely used for sending e-mail attachments, because SMTP – in its original form – was designed to transport 7-bit ASCII characters ...
Full r,g,b or r,g,b,a values (QOI_OP_RGB or QOI_OP_RGBA) The color channels are assumed to not be premultiplied with the alpha channel (“un-premultiplied alpha”). A running array[64] (zero-initialized) of previously seen pixel values is maintained by the encoder and decoder.
By default, Windows Vista ships with JPEG, TIFF, GIF, PNG, BMP and HD Photo encoders and decoders, and an ICO decoder. Additionally, as of 2009, some camera manufacturers [2] and 3rd-parties [3] [4] have released WIC codecs for proprietary raw image formats, enabling Mac-like raw image support to Windows 7 and Vista. [5]
This means that any binary data one wants to carry in XMP, such as thumbnail images, must be encoded in some XML-friendly format, such as Base64. XMP metadata can describe a document as a whole (the "main" metadata), but can also describe parts of a document, such as pages or included images.
To achieve this, it uses more processing power for the encoding (asymmetry) while retaining full compatibility with the JPEG standard and requiring no changes on the decoder side. The techniques MozJPEG uses to achieve high compression include optimising Huffman trees, using progressive coding to optimally split the spectrum of DCT coefficients ...
More common today is the Base64 format, which is based on the same concept of alphanumeric-only as opposed to ASCII 32–95. All three formats use 6 bits (64 different characters) to represent their input data. Base64 can also be generated by the uuencode program and is similar in format, except for the actual character translation: