3 ms·

It already exists - progressive jpeg is interlaced.

• throwaway14356 4y ago
  Grainy tv signals are similar too. Much better than the it works or it doesn't work. Progressieve jpeg can do at most 5 passes and is a lossy format. It is designed to display fast then improve the resolution. Perhaps there are implementations that can partially load or stop loading it but it wasn't the goal was it? Imagine a thumbnail. You have some data there. One clicks on it and a larger version is shown using the thumb in stead of starting from scratch, now one zoons in on the image, surely loading different images from scratch every time is not the right approach? in stead we just don't serve the high resolution version that we [obviously] do have.
  • astrange 4y ago
    This is wavelets aka JPEG2K. The problem is that 1. they don't compress well, because they look blurry which is unpleasant 2. they are inefficient to decode because of poor memory locality. So that's why most codecs use macroblocks instead. IIRC Ogg Vorbis also originally supported this for audio but nobody used it.