I am planning to show some Image Processing research results on which the final step is a sharpening operation:
convert -sharpen '0.0x0.5' in.png out.png In case I'm asked, what, precisely, does "convert" use for sharpening? My guess, without looking into the Source Code, is that it is using an un-sharp mask. Maybe one of the developers could give me the correct answer. If it is an unsharp mask, what type of low-pass filter is the mask? I'm guessing a Gaussian, since within `display' the "sharpen" function requests two parameters: "sharpening radius" x "standard deviation". The latter parameter suggests a Gaussian. By the way, when I vary the "sharpening radius" I see no difference in output. The "standard deviation" controls the amount of sharpening performed. Why is this? Any answers to my questions will be much appreciated. Thanks. Dean S. Messing Sr. Scientist Display Algorithms & Visual Optimization Lab Information Systems Technologies Dept. Sharp Laboratories of America _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
