这里直接引用官方描述:
TheGPUImageframeworkisaBSD-licensediOSlibrarythatletsyouapplyGPU-acceleratedfiltersandothereffectstoimages,livecameravideo,andmovies.IncomparisontoCoreImage(partofios5.0),GPUImageallowsyoutowriteyourowncustomfilters,supportsdeploymenttoiOS4.0