Как увеличить яркость GPUImage?

Question

Я использую библиотеку GPUImage от BradLarson для фильтрации изображения. Я использую код this в моем проекте.

GPUImagePicture *staticPicture; 

Применение фильтров, как это -

-(void) setFilter:(int) index { 
    switch (index) { 
     case 1:{ 
     filter = [[GPUImageContrastFilter alloc] init]; 
     [(GPUImageContrastFilter *) filter setContrast:1.75]; 
    } break; 
    case 2: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"crossprocess"]; 
     } break; 
     case 3: { 
      filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"02"]; 
     } break; 
     case 4: { 
     filter = [[GrayscaleContrastFilter alloc] init]; 
     } break; 
     case 5: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"17"]; 
     } break; 
     case 6: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"aqua"]; 
     } break; 
     case 7: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"yellow-red"]; 
     } break; 
     case 8: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"06"]; 
     } break; 
     case 9: { 
     filter = [[GPUImageToneCurveFilter alloc] initWithACV:@"purple-green"]; 
     } break; 
     default: 
     filter = [[GPUImageFilter alloc] init]; 
     break; 
    } 

Теперь я хочу, чтобы увеличить brighness в GPUImage без изменения текущего прикладную filter.How сделать это?

Answer 1

Включить следующие методы

-(UIImage*)applyFilterForImage:(UIImage*)img value:(NSNumber*)filterValue 
{ 
    switch (type) { 
     case kPhotoBrightness: 
      self.filterImage = [self applyBrightnessForImage:img value:filterValue]; 
      break; 

     case kPhotoContrast: 
      self.filterImage = [self applyContrastForImage:img value:filterValue]; 
      break; 

     case kPhotoSaturation: 
      self.filterImage = [self applySaturationForimage:img value:filterValue]; 
      break; 

     case kPhotoHue: 
      self.filterImage = [self applyHueForImage:img value:filterValue]; 
      break; 

     case kPhotoSharpness: 
      self.filterImage = [self applySharpnessForImage:img value:filterValue]; 
      break; 

     default: 
      break; 
    } 
    return self.filterImage; 
} 

-(UIImage*)applyBrightnessForImage:(UIImage*)img value:(NSNumber*)filterValue { 
    GPUImageBrightnessFilter *brightnessFilter = (GPUImageBrightnessFilter*)self.filter; 
    [brightnessFilter setBrightness:[filterValue floatValue]]; 
    return [self outputImageForFilter:brightnessFilter andImage:img]; 
} 

//output the filtered image 
-(UIImage*)outputImageForFilter:(GPUImageOutput<GPUImageInput>*)_filter andImage:(UIImage*)_image { 

    GPUImagePicture *filteredImage = [[GPUImagePicture alloc]initWithImage:_image]; 
    [filteredImage addTarget:_filter]; 
    [filteredImage processImage]; 
    return [_filter imageFromCurrentlyProcessedOutputWithOrientation:_image.imageOrientation]; 
}