error: zTXt: chunk data is too large (libpng failed)

[zhangciwu]

Like this issue:
ImageMagick/ImageMagick#1301

1. Download bug.png
2. Run command pngquant bug.png
3. Got error:

  error: zTXt: chunk data is too large (libpng failed)
  error: cannot decode image bug.png

It's because libpng has a too small default limit value for chunk size, should be able to solved like the issue above, (ImageMagick/ImageMagick@e6f6f88)
I've tried to solve it, but two projects are very different, out of my ability.

[MrMadClown]

I ran into the same Issue, any news on this?

[zhangciwu]

@MrMadClown You can try modify libpng like this: https://sourceforge.net/u/zhangciwu/libpng/ci/0589c3bee961d9a147a8872b97b0ebea4a2e9afd/

[MrMadClown]

Not a solution, but FYI for anyone stumbling over this issue.

In my case I could prevent the error by stripping out meta-data beforehand. I just tested with the provided bug.png and could run pngquant on it.
My png came from a jpg containing ClippingPaths which made up like 90% of the filesize, with those removed, I did not encounter the error again.
I couldn't figure out what the issue with the bug.png is.