com.sksamuel.scrimage.nio.PngWriter.NoCompression writes max compressed PNG images

[andynugent]

In the function com.sksamuel.scrimage.nio.PngWriter.write(AwtImage, ImageMetadata, OutputStream) when the compression level is zero, the switch statement falls through to the default and the compression is set to mode=MODE_EXPLICIT and quality=0.0 (e.g. the same as for MaxCompression).

I've only noticied this for PNGs with NoCompression, but I think it's a general problem for any value between 2 and 8 as well, e.g.

compressionLevel = 9 results in param.setCompressionQuality(0.0f) (0.0 is highest compression)
compressionLevel = 8 results in param.setCompressionQuality(8 / 10f)
...
compressionLevel = 2 results in param.setCompressionQuality(2 / 10f)
compressionLevel = 1 results in param.setCompressionQuality(1.0f) (1.0 is lowest compression)