Package: zopfli Version: 1.0.1+git160119-2 Thanks for adding zopflipng to the package. However, I just found one scenario in which it gives undesirable results. That is with small images (<4K of uncompressed image data) that only use shades of gray (and optionally an alpha channel). There is an optimization in the code for such small images, however that optimization enforces RGB(A) color mode, which therefore causes unnecessary large files if there are only shades of gray in the image. I already reported this bug upstream [1]. However, upstream development seems to be stalled. The last commit was a year ago, while the numbers of issues are growing. So I wonder if you would consider adding patches to fix bugs like this to the Debian package? For this particular bug, you find the patch (it is a tiny change) inline in my comment on the upstream issue.
[1]: https://github.com/google/zopfli/issues/34#issuecomment-300523295
