GPUImage翻译四：内置滤镜（混合模式Blending）

混合模式（Blending modes）

• GPUImageChromaKeyBlendFilter: Selectively replaces a color in the first image with the second image

  • thresholdSensitivity: How close a color match needs to exist to the target color to be replaced (default of 0.4)
  • smoothing: How smoothly to blend for the color match (default of 0.1)

• GPUImageDissolveBlendFilter: Applies a dissolve blend of two images

  • mix: The degree with which the second image overrides the first (0.0 - 1.0, with 0.5 as the default)

• GPUImageMultiplyBlendFilter: Applies a multiply blend of two images

• GPUImageAddBlendFilter: Applies an additive blend of two images

• GPUImageSubtractBlendFilter: Applies a subtractive blend of two images

• GPUImageDivideBlendFilter: Applies a division blend of two images

• GPUImageOverlayBlendFilter: Applies an overlay blend of two images

• GPUImageDarkenBlendFilter: Blends two images by taking the minimum value of each color component between the images

• GPUImageLightenBlendFilter: Blends two images by taking the maximum value of each color component between the images

• GPUImageColorBurnBlendFilter: Applies a color burn blend of two images

• GPUImageColorDodgeBlendFilter: Applies a color dodge blend of two images

• GPUImageScreenBlendFilter: Applies a screen blend of two images

• GPUImageExclusionBlendFilter: Applies an exclusion blend of two images

• GPUImageDifferenceBlendFilter: Applies a difference blend of two images

• GPUImageHardLightBlendFilter: Applies a hard light blend of two images

• GPUImageSoftLightBlendFilter: Applies a soft light blend of two images

• GPUImageAlphaBlendFilter: Blends the second image over the first, based on the second's alpha channel

  • mix: The degree with which the second image overrides the first (0.0 - 1.0, with 1.0 as the default)

• GPUImageSourceOverBlendFilter: Applies a source over blend of two images

• GPUImageColorBurnBlendFilter: Applies a color burn blend of two images

• GPUImageColorDodgeBlendFilter: Applies a color dodge blend of two images

• GPUImageNormalBlendFilter: Applies a normal blend of two images

• GPUImageColorBlendFilter: Applies a color blend of two images

• GPUImageHueBlendFilter: Applies a hue blend of two images

• GPUImageSaturationBlendFilter: Applies a saturation blend of two images

• GPUImageLuminosityBlendFilter: Applies a luminosity blend of two images

• GPUImageLinearBurnBlendFilter: Applies a linear burn blend of two images

• GPUImagePoissonBlendFilter: Applies a Poisson blend of two images

  • mix: Mix ranges from 0.0 (only image 1) to 1.0 (only image 2 gradients), with 1.0 as the normal level
  • numIterations: The number of times to propagate the gradients. Crank this up to 100 or even 1000 if you want to get anywhere near convergence. Yes, this will be slow.

• GPUImageMaskFilter: Masks one image using another