PML (Portable Middle Link) is a lossy raster image compression format created as a compromise between the perfectly accurate PNG and traditional JPEG.
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updated Sep 20, 2026
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Portable-Middle-Link-
PML (Portable Middle Link) is a lossy raster image compression format created as a compromise between the perfectly accurate PNG and traditional JPEG.
The compression pipeline consists of five steps: YCbCr Color Space: Separating the signal into luma (Y) and chroma (Cb, Cr) components. Chroma Subsampling (4:2:0): Reducing the resolution of the chroma channels by a factor of 2. Linear Quantization: Truncating noise with step=4 for Y and step=8 for Cb/Cr. Sub-filtering: Calculating horizontal differences between adjacent pixels to transform the raster into an array of zeros. DEFLATE Compression: Independent channel packaging via the zlib algorithm with a 20-byte header.
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PML (Portable Middle Link) is a lossy raster image compression format created as a compromise between the perfectly accurate PNG and traditional JPEG.
0
3 commits
updated Sep 20, 2026
See what people are saying (1)
README
Portable-Middle-Link-
PML (Portable Middle Link) is a lossy raster image compression format created as a compromise between the perfectly accurate PNG and traditional JPEG.
The compression pipeline consists of five steps: YCbCr Color Space: Separating the signal into luma (Y) and chroma (Cb, Cr) components. Chroma Subsampling (4:2:0): Reducing the resolution of the chroma channels by a factor of 2. Linear Quantization: Truncating noise with step=4 for Y and step=8 for Cb/Cr. Sub-filtering: Calculating horizontal differences between adjacent pixels to transform the raster into an array of zeros. DEFLATE Compression: Independent channel packaging via the zlib algorithm with a 20-byte header.
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Contributors
3 commits