It's easy to crop,rotate,change colors of images.I want to use some senior image porcessing functions like DCT or FFT on HTML5 canvas? Is there any ready-made libs? crop http://www.webresourcesdepot.com/jquery-image-crop-plugin-jcrop[^] rotate http://code.google.com/p/jquery-rotate/[^] change colors http://github.com/mezzoblue/PaintbrushJS[^] dct http://en.wikipedia.org/wiki/Discrete_cosine_transform[^] fft http://en.wikipedia.org/wiki/Fft[^] javascript dct fft