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index.lua

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require"imlua"

local filename = "lena.jpg"

local image = im.FileImageLoad(filename)

local r = image[0]

local g = image[1]

local b = image[2]

for row = 0, image:Height() - 1, 10 do

for column = 0, image:Width() - 1, 10 do

r[row][column] = 0

g[row][column] = 0

b[row][column] = 0

end

end

image:Save("lena_indexing.bmp", "BMP")