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result of homework1 part 2&3

here is my original image, its size is 256*256

here is grey image, I use the maximization of R,G,B channels to transform my original image to grey image.

here is the image I manipulate by using 3*3 filter
[1,1,1
1,-7,1
1,1,1]
, first, I pad the original image with 0 to keep the filtered image's size same with the original one, and then do the 2D convolution using the filter given above to the padded image and get the result image above.