Image_Transform - new effects

Hi guys, I was playing with GD and came up with a few effects. I've posted them here: http://www.phpied.com/image-fun/ Some of them may be added as enhancements to the Image_Transform package. Let me know what you think. I can cooperate in cleaning up, documenting and adding them to Image_Transform or to another class that extends Image_Transform, for example Image_Transform_PixelOperations. Because these are in essence pixel operations, performed on a single pixel. Image_Transform_Filters might be another extension that can have effects such as blur, edge detect, sharpen, etc. My current code is concentrates on the operations themselves, not so much on reading, validating and writing images, something that Image_Transform already does pretty well. Also my implementation is designed to be extensible, one can easily add a new effect by providing a callback function that does something and returns a Pixel object. Regards, Stoyan