Overview of JPEG XL
JPEG XL is a feature-rich image coding system optimized for web, promising better quality and compression than traditional JPEG. It supports advanced features like animation and high dynamic range.
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JPEG XL is the latest addition to the JPEG family, offering a feature-rich image coding system optimized for responsive web environments. It allows for seamless transition from legacy JPEG formats, reducing storage costs by serving both JPEG and JPEG XL clients with a single file. The migration process from existing JPEG files to JPEG XL is efficient and maintains backward compatibility. This new standard supports wide color gamut, high dynamic range, and high bit depth images, along with features like animation, alpha channels, and lossless coding. JPEG XL promises better image quality and compression ratios compared to traditional JPEG, without requiring additional hardware acceleration for encoding and decoding. The codec is designed to balance fidelity, speed, and compression ratio, catering to various applications such as photo galleries, e-commerce, and social media. Currently, JPEG XL is being developed in multiple parts, including core coding system, file format specification, conformance testing, and reference software for implementation.
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5 commentsIn order to get the non-DCT lossy compression, you need to request "Modular Mode" in the program that compresses the image. But for some reason I don't know, Irfanview is literally hiding that checkbox from you, and you can enable the feature by editing the dialog resource and making the checkbox no longer hidden.
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Meanwhile, I still prefer WEBP for lossless compression, because the decompression code is so fast. In terms of who has the best lossless compression, WEBP and JXL easily beat AVIF, and JXL usually beats WEBP, but not always. In one case, I saw a grayscale BMP file getting better compression with FLAC (!) than JXL.
WEBP's lossy format is just not that good, AVIF and JXL beat the hell out of it, sometimes the JPEG even looks better. But WEBP's lossless format is excellent.
And why this format should be more-supported than currently: https://jpegxl.info/why-jxl.html
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