Sharpen Filter - Imaging Lingo

 

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This algorithm will sharpen an image. It's equivalent to the sharpen filter in Photoshop.

-- Sharpen Image Algorithm -- ©2005 by Josh Chunick (josh@chunick.com) -- This code is free to use in commercial applications -- or however you want.If you use this code you -- must keep the comments, including this message, -- intact. Feel free to add any changes or make -- improvements. -- anImage is an image object -- theAmount is an integer, higher values sharpen more on sharpenImage (theImage, theAmount)      theWidth = theImage.width - 1   theHeight = theImage.height - 1   newImage = theImage.duplicate()   -- the look-up table for the original image (done for speed purposes)   listX = []   listY = []   repeat with x = 0 to theWidth     repeat with y = 0 to theHeight       listY.add(theImage.getPixel(x,y))     end repeat     listX.add(listY)     listY = []   end repeat   -- draw each pixel in the new image   repeat with y1 = 2 to theHeight     repeat with x1 = 2 to theWidth              -- get the 2 pixels we need for sharpening       theColour1 = listX[x1][y1]       theColour2 = listX[x1 - 1][y1 - 1]              newColour = theColour1 + theAmount * (theColour1 - theColour2)              --Set this pixel into the new image       newImage.setPixel(point(x1 - 1,y1 - 1), newColour)            end repeat   end repeat      return newImage    end

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