How to get the list of filter names in CIFilter class?

Question

I am using the following code for exposure adjustment and its working. I need the filter names for sharpen, denoise, highlighs, color temperature, shadows, blur, etc.

Answer 1

May be you can try following method of CIFilter class

+ (NSArray *)filterNamesInCategory:(NSString *)category

Answer 2

All you need to do is ask CIFilter for the filter names. You can then ask each filter for its attributes, which returns a dictionary that describes each input and output parameter that the filter accepts.

NSArray* filters = [CIFilter filterNamesInCategories:nil];
for (NSString* filterName in filters)
{
    NSLog(@"Filter: %@", filterName);
    NSLog(@"Parameters: %@", [[CIFilter filterWithName:filterName] attributes]);
}

For example, this is the output of the above code for the CIZoomBlur filter:

Filter: CIZoomBlur
Parameters: {
    CIAttributeDescription = "Simulates the effect of zooming the camera while capturing the image.";
    CIAttributeFilterCategories =     (
        CICategoryBlur,
        CICategoryVideo,
        CICategoryStillImage,
        CICategoryBuiltIn
    );
    CIAttributeFilterDisplayName = "Zoom Blur";
    CIAttributeFilterName = CIZoomBlur;
    CIAttributeReferenceDocumentation = "http://developer.apple.com/cgi-bin/apple_ref.cgi?apple_ref=//apple_ref/doc/filter/ci/CIZoomBlur";
    inputAmount =     {
        CIAttributeClass = NSNumber;
        CIAttributeDefault = 20;
        CIAttributeDescription = "The zoom-in amount. Larger values result in more zooming in.";
        CIAttributeDisplayName = Amount;
        CIAttributeIdentity = 0;
        CIAttributeMin = 0;
        CIAttributeSliderMax = 200;
        CIAttributeSliderMin = 0;
        CIAttributeType = CIAttributeTypeDistance;
        CIUIParameterSet = CIUISetBasic;
    };
    inputCenter =     {
        CIAttributeClass = CIVector;
        CIAttributeDefault = "[150 150]";
        CIAttributeDescription = "The x and y position to use as the center of the effect.";
        CIAttributeDisplayName = Center;
        CIAttributeType = CIAttributeTypePosition;
        CIUIParameterSet = CIUISetBasic;
    };
    inputImage =     {
        CIAttributeClass = CIImage;
        CIAttributeDescription = "The image to use as an input image. For filters that also use a background image, this is the foreground image.";
        CIAttributeDisplayName = Image;
        CIUIParameterSet = CIUISetBasic;
    };
    outputImage =     {
        CIAttributeClass = CIImage;
    };
}

Most of the time, though, you'll probably just use the docs.

Answer 3

iOS 14, Swift 5

Must confess not easy to read, but an answer that is comparable to the first one on Objective C.

for filtername in filters {
  print("filter \(filtername)")
  print("attributes \(CIFilter.init(name: filtername)?.attributes.keys.description)")
}

Produces this ...

filter CIAccordionFoldTransition
attributes Optional("[\"inputImage\", \"CIAttributeFilterDisplayName\",     \"inputTargetImage\", \"CIAttributeFilterAvailable_iOS\", \"CIAttributeFilterAvailable_Mac\", \"inputNumberOfFolds\", \"inputFoldShadowAmount\", \"inputBottomHeight\", \"CIAttributeReferenceDocumentation\", \"inputTime\", \"CIAttributeFilterCategories\", \"CIAttributeFilterName\"]")
filter CIAdditionCompositing
attributes Optional("[\"CIAttributeFilterCategories\", \"CIAttributeFilterName\", \"CIAttributeFilterDisplayName\", \"inputImage\", \"CIAttributeReferenceDocumentation\", \"CIAttributeFilterAvailable_iOS\", \"CIAttributeFilterAvailable_Mac\", \"inputBackgroundImage\"]")

So the info is there in these long strings, you just need to pick it out :)

Answer 4

I was writing to your earlier post link to all filters. I will repeat: link to all filters.

And for example You need Blur effect. Blur is category and have 7 filters:

• CIBoxBlur
• CIDiscBlur
• CIGaussianBlur
• CIMedianFilter
• CIMotionBlur
• CINoiseReduction
• CIZoomBlur.

And etc..

Answer 5

NSLog(@"Distortion: %@", [CIFilter filterNamesInCategory:kCICategoryDistortionEffect]);
NSLog(@"Blurs: %@", [CIFilter filterNamesInCategory:kCICategoryBlur]);
NSLog(@"Color effects: %@", [CIFilter filterNamesInCategory:kCICategoryColorEffect]);
NSLog(@"Color adjustment: %@", [CIFilter filterNamesInCategory:kCICategoryColorAdjustment]);
NSLog(@"Built-in effects: %@", [CIFilter filterNamesInCategory:kCICategoryBuiltIn]);

Answer 6

In Swift (4.2, at the time of writing this), you can use this code to get all filter names:

For filters in a specified category:

CIFilter.filterNames(inCategory: "Name_of_the_category")

For filters in specified categories:

CIFilter.filterNames(inCategories: ["Name_of_the_category_1", "Name_of_the_category_2"])

For filters in all categories, just pass nil either in inCategory or inCategories:

CIFilter.filterNames(inCategory: nil)

or

CIFilter.filterNames(inCategories: nil)

All the functions above returns an Array of the filter names in String values:

[ "CIAccordionFoldTransition", "CIAdditionCompositing", "CIAffineClamp", "CIAffineTile", "CIAffineTransform", "CIAreaAverage", "CIAreaHistogram"... ]