Vivid

by YuAo

YuAo / Vivid

Filters and Utilities for Core Image

453 Stars 54 Forks Last release: over 4 years ago (0.8) MIT License 111 Commits 9 Releases

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Vivid

CocoaPods Platform CocoaPods Version CocoaPods License

A set of filters and utilities for Apple's Core Image framework.

Available on both OS X and iOS.

Involving...

Core Image Filters

Filters

YUCIRGBToneCurve

Adjusts tone response of the R, G, and B channels of an image.

The filter takes in an array of control points that define the spline curve for each color component, or for all three in the composite.

These are stored as

CIVector
s in an
NSArray
, with normalized X and Y coordinates from
0
to
1
.

The defaults are

[(0,0), (0.5,0.5), (1,1)]

Preview

YUCIColorLookup

Uses a color lookup table (LUT) to remap the colors in an image. The default LUT can be found at

Sources/YUCIColorLookupTableDefault.png

This filter may not work well in the default light-linear working color space. Use

kCIContextWorkingColorSpace
key to specify a working color space when creating the
CIContext
object.

Preview

YUCISurfaceBlur

A bilateral filter. Blurs an image while preserving edges. This filter is almost identical to Photoshop's "Surface Blur" filter.

Useful for creating special effects and for removing noise or graininess. Slow on large

inputRadius
.

Preview

YUCITriangularPixellate

Maps an image to colored triangles.

Preview

YUCIFXAA

A basic implementation of FXAA (Fast Approximate Anti-Aliasing).

Preview

YUCIHistogramEqualization

Perform a Histogram Equalization on the input image. Internally uses

Accelerate.framework
.

Preview

YUCIReflectedTile

Produces a tiled image from a source image by reflecting pixels over the edges.

Preview

YUCICLAHE

Perform a Contrast Limited Adaptive Histogram Equalization on the lightness channel of the input image.

Preview

Transitions

YUCICrossZoomTransition

A transition that pushes the

inputImage
toward the viewer and then snaps back with the
inputTargetImage
.

Preview

YUCIFlashTransition

Transitions from one image to another by creating a flash effect.

Preview

Generators

YUCIStarfieldGenerator

Generate a starfield image. Animatable by changing the

inputTime
parameter. Based on Star Nest by Pablo Román Andrioli

Preview

YUCIBlobsGenerator

Generate a image with colorful blobs. Animatable by changing the

inputTime
parameter. Based on Blobs by @paulofalcao

Preview

Utilities

YUCIFilterConstructor

A singleton that conforms to

CIFilterConstructor
protocol.

Can be used in

+[CIFilter registerFilterName:constructor:classAttributes:]
to register a
CIFilter
. This filter constructor simply assume that the
filterName
is the class name of the custom
CIFilter
and calls
[[FilterClass alloc] init]
to construct a filter.

YUCIFilterPreviewGenerator

Can be used to generate a preview image/gif for a filter. All the preview images/gifs on this page are generated by this utility. For demonstration/testing purposes only, do not use it in your production code.

Next

  • [x] Add filter previews to readme.
  • [x] AA for triangular pixellate filter.
  • [x] CLAHE
  • [ ] Write a paper on the implementation of CLAHE.
  • [ ] Kuwahara filter

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