ALT GitHub Actions bot comment showing that images were automatically compressed by Calibre’s image-actions. The comment reports a 47.1% reduction in image size, saving 104.46 KB. A table displays one example file (‘Screen Shot 2020-09-17 at 3.29.33 pm.png’) reduced from 221.87 KB to 117.41 KB. It notes that 348 images did not require optimisation, and includes a ‘View diff’ link for visual comparison.

ALT Screenshot of an SVG file that includes an embedded image using base64 encoding. The image is inserted directly within the <image> tag using the xlink:href attribute, rather than linking to an external file. This means the entire image is stored inside the SVG as base64 data.

ALT Spectral images have a significant memory footprint because they store a large number of spectral bands. In this paper, we propose a lossy compression scheme that significantly reduces their file size with a negligible loss in quality. We use a cosine transform and separate overall brightness from the shape of the spectrum. The resulting channels are stored using JPEG XL, which provides state-of-the-art lossy compression.

ALT 580K Sites load images from S3 instead of a CDN, 200K Sites load more than 1MB from S3 Source: HTTP Archive, October 2024

ALT Selfie con las personas que han asistido al tler de optimización de imágenes en la Pulpocon 2024

ALT Terminal screenshot of the jpegli tools' folder content

ALT Chrome DevTools Network tab listing 4 jpeg images