com.google.appengine.api.images.OutputSettings only has support for one 
setQuality parameter. This works for the RGB image quality but when you add 
an alpha channel it seems to always use lossless compression. So as soon as 
I add an alpha channel to a webp image the size explodes.

https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/images/OutputSettings

When using the command line webP I can see there is an option to set 
quality on the alpha.

MBProJack:Downloads jacques$ cwebp -q 50  -alpha_q 50  input.png -o out.webp


There definitely should be support for setting the compression quality for 
the alpha channel.

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