iOS gpuimage 使用GPUImageLookupFil

self.filterLookup= [[GPUImageLookupFilteralloc]init];

self.lookupImageSource= [[GPUImagePicturealloc]initWithImage:[UIImageimageNamed:fitlername]];

[self.lookupImageSourceaddTarget:self.filterLookupatTextureLocation:1];

[self.lookupImageSourceuseNextFrameForImageCapture];

[self.lookupImageSourceprocessImage];

然后不要在viewwillappear上写。