Feature List:
Pixel/channel operations apply to r,g,b and a seperately, sometimes y and u/v as well:
expand (max dynamic range), invert, copy to/from alpha, swap with alpha etc...

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Matrix operations: edge detect, blur, key smoother

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Keys: rgb keying and chroma/yuv keying with superior quality

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Pattern effects to seamlessly tile images in various formations include looping effects

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Distortion effects: seamless bulge and squish, change point location, magnify, flowerify and remove perspective

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Colour adjusters: adjust hue, saturation and lightness, adjust rgba, adjust yuv and tint

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Miscellaneous: rotate move scale, wipe, dither, quantize...etc.

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Effect Containers: oval inside/outside, rectangle inside/outside, keep alpha, keep non-alpha, mix to parent alpha, mix to parent non-alpha...

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Build-your-own effect using above modular effects, grouped in (effect) containers and sequenced as desired..