How to do PngCrush for my images of iOS app?

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What is PngCrush in iOS?

I'm having a doubts about image optimisation technique of iOS apps Pngcrush My doubt is, Is pngcrush built-in to xcode or do we need to explicitly download pngcrush tool and optimise our images? If we want to do it explicitly how can we achieve this?

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This question may solve your problem: Skipping the 'CompressResources' build step for XCode iPhone apps

Another thing is there might chances that the PNGs are of type JPG's and the Extentation has been modified with png.