CoreImage

CIFilter

找出FilterName

[CIFilter filterNamesInCategory:nil]

回傳一個符合條件的FilterNamesArray

輸入CategoryKey或者輸入nil（回傳全部）

Result:

CategoryKey

extern NSString *kCICategoryDistortionEffect ; 
extern NSString *kCICategoryGeometryAdjustment ; 
extern NSString *kCICategoryCompositeOperation ; 
extern NSString *kCICategoryHalftoneEffect ; 
extern NSString *kCICategoryColorAdjustment ; 
extern NSString *kCICategoryColorEffect ; 
extern NSString *kCICategoryTransition ; 
extern NSString *kCICategoryTileEffect ; 
extern NSString *kCICategoryGenerator ; 
extern NSString *kCICategoryReduction ; 
extern NSString *kCICategoryGradient ; 
extern NSString *kCICategoryStylize ; 
extern NSString *kCICategorySharpen ; 
extern NSString *kCICategoryBlur ; 
extern NSString *kCICategoryVideo ; 
extern NSString *kCICategoryStillImage ; 
extern NSString *kCICategoryInterlaced ; 
extern NSString *kCICategoryNonSquarePixels ; 
extern NSString *kCICategoryHighDynamicRange ; 
extern NSString *kCICategoryBuiltIn ; 
extern NSString *kCICategoryFilterGenerator;

Library傳送門

查詢CIFilter詳細資訊

NSLog(@"%@",[[CIFilter filterWithName:@"CIAdditionCompositing"] attributes]);

回傳有關這個Name的Filter的相關參數資訊

Result:

CIAttributeFilterCategories

這個Filter是被分類在哪些Categories

（用這些Categories Key可以找到這個Filter）

CIAttributeFilterDisplayName

這個Filter的顯示名稱

CIAttributeFilterName

這個Filter的名稱（剛剛函數輸入的名字）

其他屬性

使用這個Filter需要用到的參數

（有的有詳細說明最大最小值）

    CIFilter *filter = [CIFilter filterWithName:@"CIAdditionCompositing"];
    CIImage *test1 = [[CIImage alloc]initWithImage:[UIImage imageNamed:@"sfffff.png"]];
    CIImage *test2 = [[CIImage alloc]initWithImage:[UIImage imageNamed:@"mark.png"]];
    [filter setValue:test1 forKey:@"inputImage"];
    [filter setValue:test2 forKey:@"inputBackgroundImage"];
    CIImage *image = [filter valueForKey:@"outputImage”];

CIAdditionCompositing

Example:

利用兩張圖片重疊添加顏色分量提高亮度

inputBackgroundImage

底圖
需用CIImage

inputImage

疊在底圖上
需用CIImage

Result:

CIAffineTransform

Example:

利用矩陣變形圖片

     CIFilter *filter = [CIFilter filterWithName:@"CIAffineTransform"];
     CIImage *test1 = [[CIImage alloc]initWithImage:[UIImage imageNamed:@"test.png"]];
     [filter setValue:test1 forKey:@"inputImage"];
     CGAffineTransform tran = CGAffineTransformMake(1, 0.5, 0, 1, 0,0);
     [filter setValue:[NSValue valueWithBytes:&tran objCType:@encode(CGAffineTransform)]
      forKey:@"inputTransform"];
     CIImage *image = [filter valueForKey:@"outputImage”];

inputImage

想要變形的圖片
需用CIImage

inputTransform

仿射矩陣
需用CGAffineTransform轉NSValue
CGAffineTransformMake(a,b,c,d,e,f)
a = [1,1],b = [1,2],c = [2,1],d = [2,2],e = [3,1],f = [3,2]
與原圖相同為(1,0,0,1,0,0)

Result:

CIBarsSwipeTransition

將兩張圖螺旋融合成一張。

Example:

     CIFilter *filter = [CIFilter filterWithName:@"CIBarsSwipeTransition"];
     CIImage *test1 = [[CIImage alloc]initWithImage:[UIImage imageNamed:@"test.png"]];
     CIImage *test2 = [[CIImage alloc]initWithImage:[UIImage imageNamed:@"sfffff.png"]];
     [filter setValue:test1 forKey:@"inputImage"];
     [filter setValue:test2 forKey:@"inputTargetImage"];
     [filter setValue:@3 forKey:@"inputAngle"];
     [filter setValue:@5 forKey:@"inputBarOffset"];
     [filter setValue:@0.5 forKey:@"inputTime"];
     [filter setValue:@5 forKey:@"inputWidth"];
   
     CIImage *image = [filter valueForKey:@"outputImage”];

inputImage