PNG is currently the only image format that works across all browsers and supports alpha channel. Backwards-compatible lossy encoding is much easier to deploy on the Web than a set of vendor-specific alternative image formats, but can still significantly reduce bandwidth and page loading times.
I’m going to present a lossy compression method for PNG images that is based on PNG filters. It’s compatible with the standard decoders and can generate files 20%-40% smaller than a usual lossless encoding.
Unlike conversion of PNG to a palette, this technique works with true-color images.
It can be applied to PNG files as they’re streamed, with relatively little computing power and memory, which makes it perfect for automatic Front-End Optimization tools and proxies.
I’m going to demonstrate tools that designers and developers can use today to recompress PNGs manually or in batches.
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