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That's an interlaced PNG: https://en.wikipedia.org/wiki/Interlacing_(bitmaps) https://en.wikipedia.org/wiki/Interlacing_(bitmaps) The image data is stored such
by wtallis 5y ago
That's an interlaced PNG: https://en.wikipedia.org/wiki/Interlacing_(bitmaps) https://en.wikipedia.org/wiki/Interlacing_(bitmaps)
The image data is stored such that downloading the first section of the file gets you enough information to display a low-resolution version of the image, and continuing the download allows for progressive refinement of the image.