混合模式（Blending modes）
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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)
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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)
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GPUImageMultiplyBlendFilter: Applies a multiply blend of two images
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GPUImageAddBlendFilter: Applies an additive blend of two images
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GPUImageSubtractBlendFilter: Applies a subtractive blend of two images
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GPUImageDivideBlendFilter: Applies a division blend of two images
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GPUImageOverlayBlendFilter: Applies an overlay blend of two images
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GPUImageDarkenBlendFilter: Blends two images by taking the minimum value of each color component between the images
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GPUImageLightenBlendFilter: Blends two images by taking the maximum value of each color component between the images
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GPUImageColorBurnBlendFilter: Applies a color burn blend of two images
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GPUImageColorDodgeBlendFilter: Applies a color dodge blend of two images
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GPUImageScreenBlendFilter: Applies a screen blend of two images
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GPUImageExclusionBlendFilter: Applies an exclusion blend of two images
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GPUImageDifferenceBlendFilter: Applies a difference blend of two images
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GPUImageHardLightBlendFilter: Applies a hard light blend of two images
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GPUImageSoftLightBlendFilter: Applies a soft light blend of two images
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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)
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GPUImageSourceOverBlendFilter: Applies a source over blend of two images
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GPUImageColorBurnBlendFilter: Applies a color burn blend of two images
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GPUImageColorDodgeBlendFilter: Applies a color dodge blend of two images
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GPUImageNormalBlendFilter: Applies a normal blend of two images
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GPUImageColorBlendFilter: Applies a color blend of two images
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GPUImageHueBlendFilter: Applies a hue blend of two images
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GPUImageSaturationBlendFilter: Applies a saturation blend of two images
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GPUImageLuminosityBlendFilter: Applies a luminosity blend of two images
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GPUImageLinearBurnBlendFilter: Applies a linear burn blend of two images
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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.
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GPUImageMaskFilter: Masks one image using another
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