Quality
Reduce NoiseReduce noise by look at it's neightbours Despeckle
Remove noise using a 'salt and peper' algorithm Remove Dust and Noise
Remove dust and noise by changing the color to the 3x3 median value Sharpen
Shapen the image Gaussian Sharp
Sharpen the image by subtracting the Gaussian blur of the image Add Noise
Add noise to the image Posterize
Posterize the image Reduce Colors
Reduce the number of colors Diffusion
Halftone an image Dither
Dithering of the image Anti Aliasing
Smooth the border and lines of the image.