using FileIO, Images
img = load("image.jpg")
sharpenkernel = reshape([-1.0, -1.0, -1.0, -1.0, 9.0, -1.0, -1.0, -1.0, -1.0], (3,3))
imfilt = imfilter(img, sharpenkernel)
save("imagesharper.png", imfilt)