Effects I coded : (see effects.c for more info )  . sobel transformation (works better in 8 bpp) edge detection . laplace transformation (works better in 8 bpp) edge detection . gamma correction to <value> . set threshold to the image (funny effects in RGB24). . salt and pepper noise . negative image . mirroring . lowpass (smoothing) . highpass (sharpening)  Well, there is not much to say about them. I dont know if sobel and laplace are ok, I got parts of this code from the net, as I said before, just digging around.I hope them helps who wants to use videodog for other apps than webcam or security. But I couldn`t make every vd user include them or use, so, they are there, but disabled.To enable is just a matter of uncoment the proper lines  in video.c, grab_one function or insert the proper sequence in grab_loop.Only the gamma correction effect has an initialization function, the gamma_lookup, to construct a lookup table, and improve the speed.Send me feedback, more effects code ( I am interested in border detection, contour, crazy transformations, and stuff).Tips on implementing your effect/processing functionFirst, check out the template, and fill it with your processing. In this case, Its just looping through the image.You should check out the vd_video.w for the depth, and apply the right processing rule.Dont forget to add a prototype to effects.h. The code should stay in effects.c/* Template for a effect function. */void myeffect (struct vd_video *vd, ....) {  // The extra parameters are on your  own         unsigned long int a=0;         for (a=0; a < vd->grab_size; a=a+vd->w) { // loop through image, in ve->w steps         	MyImageProcessingAlgorithm(*vd->grab_data + a); // reach each RGB element			} }After that, reach the video.c file and place the call to your effect in the HOOK mark, near a /* HOOK for effects */ In this point, there will be a complete image in the buffer.The processing dynamic is the following:Loop through the buffer, stepping by w bytes each time ( w means the RGB size ).Do your calculation. DoneThings got a little scary when dealing with kernel processing, like sobel or laplace. But its not that difficult, just format your matrix and figure out how to reach the proper elements.Links:http://www.cee.hw.ac.uk/hipr/html/hipr_top.htmlhttp://www.ee.uwa.edu.au/~braunl/improv/http://www.efg2.com/Lab/Library/ImageProcessing/Algorithms.htmThats it, Good luck.Gleicon