Apply PNG size optimization, as proposed by Matthew Strait on Savannah (bug #75506 https://savannah.cern.ch/bugs/?75506)
Apply PNG size optimization, as proposed by Matthew Strait on Savannah (bug #75506 https://savannah.cern.ch/bugs/?75506)


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@36781 27541ba8-7e3a-0410-8455-c3a389f83636

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