In image compression, and encoder can transform representations of pixels and/or samples or color samples, such as by performing principal component analysis (PCA) on the pixels to generate a transformation matrix, compress the transformed pixels and/or encode the samples, and transmit the compressed pixels to a decoder. The decoder can decompress the pixels and/or decode the samples received from the encoder, and transform the pixels. The decoder can transform the pixels with an inverse matrix of the transformation matrix or any arbitrary matrix. The pixels can represent a color space either before or after transformation.
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Massimino, Pascal and Ustarroz-Calonge, Maryla Isuka Waclawa, "Transforming Color Space With Arbitrary Matrix", Technical Disclosure Commons, (August 10, 2020)