Reduce Noise Reduce noise by look at it's neightboursDespeckle Remove noise using a 'salt and peper' algorithmRemove Dust and Noise Remove dust and noise by changing the color to the 3x3 median valueSharpen Shapen the imageGaussian Sharp Sharpen the image by subtracting the Gaussian blur of the imageAdd Noise Add noise to the imagePosterize Posterize the imageReduce Colors Reduce the number of colorsDiffusion Halftone an imageDither Dithering of the imageAnti Aliasing Smooth the border and lines of the image.