2 ms·

There are both lossy and lossless jbig2 variants.

• AlotOfReading 4y ago
  Unless something has changed, Google books has always used the lossy encoding. Quoting the original paper: The most obvious way to compress pages is to losslessly encode them as a single 1 bpp image (see Figure 2). However, we get much better compression by using symbol encoding and accepting some loss of image data. Although our compression is lossy it is not clear how much information is actually being lost - the letter forms on a page are obviously supposed to be uniform in shape, the variation comes from printing errors and lack of resolution in image capture. Probably only a small fraction of errors are JBIG2 substitutions though.