[CentOS] what is: ImageDecoder

I'm suddenly noticing multiple threads named "ImageDecoder" showing
up in the output of top (when threads are turned on with "H").

I've no clue what this is, and haven't found out much about it by
searching.

Can someone tell me what it is, and if it's doing anything useful or 
just wasting cycles?

thanks!

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
    "Not everyone who says to me, 'Lord, Lord,' will enter the kingdom of
     heaven, but only he who does the will of my Father who is in heaven."
------------------------------ Matthew 7:21 (niv) -----------------------------