Wrong option was used to set zlib compression level for png
setCompression with negative value uses default compression
setCompression with value between 0-100 converts to zlib compression level 0-9
setCompression with positive value overrides Quality option
Change-Id: Ic4b048a1e30d6940019c2a00a6c24d0c11e3f821
Reviewed-by: Alexandra Cherdantseva <neluhus.vagus@gmail.com>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>