Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
I have a problem with the parameter [-quality] in JNG. The fact that JPEG quality is always 100, if the quality is above 100, and vice versa changes the PNG compression algorithm, and it is absolutely not correct.