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Hub AI
QOI (image format) AI simulator
(@QOI (image format)_simulator)
Hub AI
QOI (image format) AI simulator
(@QOI (image format)_simulator)
QOI (image format)
The Quite OK Image Format (QOI) is a specification for lossless image compression of 24-bit (8 bits per color RGB) or 32-bit (8 bits per color with 8-bit alpha channel RGBA) color raster (bitmapped) images, invented by Dominic Szablewski and first announced on 24 November 2021.
It is an open source lossless compression method that is faster and easier to implement than PNG. Figures specified in the blog post announcing the format claim 20-50x faster encoding and 3-4x faster decoding speed compared to PNG, both with similar file sizes. The author has donated the specification to the public domain (CC0).
QOI is supported by FFmpeg (v5.1+), GIMP (v3.0+), GraphicConverter (v11.8+), ImageGlass (v8.5+, read-only), ImageMagick (v7.1.0-20+), Imagine (v1.3.9+), and IrfanView (v4.60+, with plugin). Microsoft PowerToys (v0.76+) for Windows 10 and 11 adds support for previewing QOI images to File Explorer. Community made plugins are available in GIMP, Paint.NET and XnView MP.
The game engine GameMaker has used a combination of bzip2 and QOI as the default storage format for texture groups since version 2022.1.0.609. Despite being smaller, files in the format decompress faster than those in the PNG format it displaced. The engine also offers plain QOI for increased decompression performance, and PNG for compatibility with tooling and web platforms.
There are also implementations for various languages such as Rust, Python, Java, C++, C# and more. A full list can be found on the project's Git(Hub) repository README.
A QOI file consists of a 14-byte header, followed by any number of data “chunks” and an 8-byte end marker.
The colorspace and channel fields are purely informative. They do not change the way data chunks are encoded.
Images are encoded row by row, left to right, top to bottom. The
decoder and encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous pixel value. An image is complete when all pixels specified by width * height have been covered. Pixels are encoded as:
QOI (image format)
The Quite OK Image Format (QOI) is a specification for lossless image compression of 24-bit (8 bits per color RGB) or 32-bit (8 bits per color with 8-bit alpha channel RGBA) color raster (bitmapped) images, invented by Dominic Szablewski and first announced on 24 November 2021.
It is an open source lossless compression method that is faster and easier to implement than PNG. Figures specified in the blog post announcing the format claim 20-50x faster encoding and 3-4x faster decoding speed compared to PNG, both with similar file sizes. The author has donated the specification to the public domain (CC0).
QOI is supported by FFmpeg (v5.1+), GIMP (v3.0+), GraphicConverter (v11.8+), ImageGlass (v8.5+, read-only), ImageMagick (v7.1.0-20+), Imagine (v1.3.9+), and IrfanView (v4.60+, with plugin). Microsoft PowerToys (v0.76+) for Windows 10 and 11 adds support for previewing QOI images to File Explorer. Community made plugins are available in GIMP, Paint.NET and XnView MP.
The game engine GameMaker has used a combination of bzip2 and QOI as the default storage format for texture groups since version 2022.1.0.609. Despite being smaller, files in the format decompress faster than those in the PNG format it displaced. The engine also offers plain QOI for increased decompression performance, and PNG for compatibility with tooling and web platforms.
There are also implementations for various languages such as Rust, Python, Java, C++, C# and more. A full list can be found on the project's Git(Hub) repository README.
A QOI file consists of a 14-byte header, followed by any number of data “chunks” and an 8-byte end marker.
The colorspace and channel fields are purely informative. They do not change the way data chunks are encoded.
Images are encoded row by row, left to right, top to bottom. The
decoder and encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous pixel value. An image is complete when all pixels specified by width * height have been covered. Pixels are encoded as: